--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -182,17 +182,16 @@
 #include "prlog.h"
 #include "prenv.h"
 #include "prprf.h"
 
 #include "mozilla/dom/MessageChannel.h"
 #include "mozilla/dom/MessagePort.h"
 #include "mozilla/dom/MessagePortBinding.h"
 #include "mozilla/dom/indexedDB/IDBFactory.h"
-#include "mozilla/dom/Promise.h"
 
 #include "mozilla/dom/StructuredCloneTags.h"
 
 #ifdef MOZ_GAMEPAD
 #include "mozilla/dom/GamepadService.h"
 #endif
 
 #include "nsRefreshDriver.h"
@@ -6366,24 +6365,16 @@ NS_IMETHODIMP
 nsGlobalWindow::Confirm(const nsAString& aString, bool* aReturn)
 {
   ErrorResult rv;
   *aReturn = Confirm(aString, rv);
 
   return rv.ErrorCode();
 }
 
-already_AddRefed<Promise>
-nsGlobalWindow::Fetch(const RequestOrScalarValueString& aInput,
-                      const RequestInit& aInit, ErrorResult& aRv)
-{
-  aRv.Throw(NS_ERROR_NOT_IMPLEMENTED);
-  return nullptr;
-}
-
 void
 nsGlobalWindow::Prompt(const nsAString& aMessage, const nsAString& aInitial,
                        nsAString& aReturn, ErrorResult& aError)
 {
   // XXX This method is very similar to nsGlobalWindow::AlertOrConfirm, make
   // sure any modifications here don't need to happen over there!
   FORWARD_TO_OUTER_OR_THROW(Prompt, (aMessage, aInitial, aReturn, aError),
                             aError, );

--- a/dom/base/nsGlobalWindow.h
+++ b/dom/base/nsGlobalWindow.h
@@ -33,20 +33,18 @@
 #include "nsIScriptObjectPrincipal.h"
 #include "nsITimer.h"
 #include "nsIDOMModalContentWindow.h"
 #include "mozilla/EventListenerManager.h"
 #include "nsIPrincipal.h"
 #include "nsSize.h"
 #include "mozFlushType.h"
 #include "prclist.h"
-#include "mozilla/dom/RequestBinding.h"
 #include "mozilla/dom/StorageEvent.h"
 #include "mozilla/dom/StorageEventBinding.h"
-#include "mozilla/dom/UnionTypes.h"
 #include "nsFrameMessageManager.h"
 #include "mozilla/LinkedList.h"
 #include "mozilla/TimeStamp.h"
 #include "nsWrapperCacheInlines.h"
 #include "nsIIdleObserver.h"
 #include "nsIDocument.h"
 #include "mozilla/dom/EventTarget.h"
 #include "mozilla/dom/WindowBinding.h"
@@ -104,17 +102,16 @@ class BarProp;
 class Console;
 class External;
 class Function;
 class Gamepad;
 class MediaQueryList;
 class MozSelfSupport;
 class Navigator;
 class OwningExternalOrWindowProxy;
-class Promise;
 class Selection;
 class SpeechSynthesis;
 class WakeLock;
 namespace indexedDB {
 class IDBFactory;
 } // namespace indexedDB
 } // namespace dom
 } // namespace mozilla
@@ -848,19 +845,16 @@ public:
 protected:
   bool AlertOrConfirm(bool aAlert, const nsAString& aMessage,
                       mozilla::ErrorResult& aError);
 
 public:
   void Alert(mozilla::ErrorResult& aError);
   void Alert(const nsAString& aMessage, mozilla::ErrorResult& aError);
   bool Confirm(const nsAString& aMessage, mozilla::ErrorResult& aError);
-  already_AddRefed<mozilla::dom::Promise> Fetch(const mozilla::dom::RequestOrScalarValueString& aInput,
-                                                const mozilla::dom::RequestInit& aInit,
-                                                mozilla::ErrorResult& aRv);
   void Prompt(const nsAString& aMessage, const nsAString& aInitial,
               nsAString& aReturn, mozilla::ErrorResult& aError);
   void Print(mozilla::ErrorResult& aError);
   void ShowModalDialog(JSContext* aCx, const nsAString& aUrl,
                        JS::Handle<JS::Value> aArgument,
                        const nsAString& aOptions,
                        JS::MutableHandle<JS::Value> aRetval,
                        mozilla::ErrorResult& aError);

--- a/dom/bindings/Bindings.conf
+++ b/dom/bindings/Bindings.conf
@@ -878,24 +878,16 @@ DOMInterfaces = {
         '__stringifier': 'ToString'
     }
 },
 
 'Rect': {
     'nativeType': 'nsDOMCSSRect',
 },
 
-'Request': {
-    'binaryNames': { 'headers': 'headers_' },
-},
-
-'Response': {
-    'binaryNames': { 'headers': 'headers_' },
-},
-
 'RGBColor': {
     'nativeType': 'nsDOMCSSRGBColor',
 },
 
 'Screen': {
     'nativeType': 'nsScreen',
 },
 

deleted file mode 100644
--- a/dom/fetch/Request.cpp
+++ /dev/null
@@ -1,113 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "Request.h"
-
-#include "nsDOMString.h"
-#include "nsISupportsImpl.h"
-#include "nsIURI.h"
-#include "nsPIDOMWindow.h"
-
-#include "mozilla/dom/Promise.h"
-
-using namespace mozilla::dom;
-
-NS_IMPL_CYCLE_COLLECTING_ADDREF(Request)
-NS_IMPL_CYCLE_COLLECTING_RELEASE(Request)
-NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(Request, mOwner, mHeaders)
-
-NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Request)
-  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
-  NS_INTERFACE_MAP_ENTRY(nsISupports)
-NS_INTERFACE_MAP_END
-
-Request::Request(nsISupports* aOwner)
-  : mOwner(aOwner)
-  , mHeaders(new Headers(aOwner))
-{
-  SetIsDOMBinding();
-}
-
-Request::~Request()
-{
-}
-
-/*static*/ already_AddRefed<Request>
-Request::Constructor(const GlobalObject& global,
-                     const RequestOrScalarValueString& aInput,
-                     const RequestInit& aInit, ErrorResult& rv)
-{
-  nsRefPtr<Request> request = new Request(global.GetAsSupports());
-  return request.forget();
-}
-
-already_AddRefed<Request>
-Request::Clone() const
-{
-  nsRefPtr<Request> request = new Request(mOwner);
-  return request.forget();
-}
-
-already_AddRefed<Promise>
-Request::ArrayBuffer(ErrorResult& aRv)
-{
-  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(GetParentObject());
-  MOZ_ASSERT(global);
-  nsRefPtr<Promise> promise = Promise::Create(global, aRv);
-  if (aRv.Failed()) {
-    return nullptr;
-  }
-
-  promise->MaybeReject(NS_ERROR_NOT_AVAILABLE);
-  return promise.forget();
-}
-
-already_AddRefed<Promise>
-Request::Blob(ErrorResult& aRv)
-{
-  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(GetParentObject());
-  MOZ_ASSERT(global);
-  nsRefPtr<Promise> promise = Promise::Create(global, aRv);
-  if (aRv.Failed()) {
-    return nullptr;
-  }
-
-  promise->MaybeReject(NS_ERROR_NOT_AVAILABLE);
-  return promise.forget();
-}
-
-already_AddRefed<Promise>
-Request::Json(ErrorResult& aRv)
-{
-  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(GetParentObject());
-  MOZ_ASSERT(global);
-  nsRefPtr<Promise> promise = Promise::Create(global, aRv);
-  if (aRv.Failed()) {
-    return nullptr;
-  }
-
-  promise->MaybeReject(NS_ERROR_NOT_AVAILABLE);
-  return promise.forget();
-}
-
-already_AddRefed<Promise>
-Request::Text(ErrorResult& aRv)
-{
-  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(GetParentObject());
-  MOZ_ASSERT(global);
-  nsRefPtr<Promise> promise = Promise::Create(global, aRv);
-  if (aRv.Failed()) {
-    return nullptr;
-  }
-
-  promise->MaybeReject(NS_ERROR_NOT_AVAILABLE);
-  return promise.forget();
-}
-
-bool
-Request::BodyUsed()
-{
-  return false;
-}

deleted file mode 100644
--- a/dom/fetch/Request.h
+++ /dev/null
@@ -1,106 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef mozilla_dom_Request_h
-#define mozilla_dom_Request_h
-
-#include "nsISupportsImpl.h"
-#include "nsWrapperCache.h"
-
-#include "mozilla/dom/RequestBinding.h"
-#include "mozilla/dom/UnionTypes.h"
-
-
-class nsPIDOMWindow;
-
-namespace mozilla {
-namespace dom {
-
-class Promise;
-
-class Request MOZ_FINAL : public nsISupports
-                        , public nsWrapperCache
-{
-  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
-  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(Request)
-
-public:
-  Request(nsISupports* aOwner);
-
-  JSObject*
-  WrapObject(JSContext* aCx)
-  {
-    return RequestBinding::Wrap(aCx, this);
-  }
-
-  void
-  GetUrl(DOMString& aUrl) const
-  {
-    aUrl.AsAString() = EmptyString();
-  }
-
-  void
-  GetMethod(nsCString& aMethod) const
-  {
-    aMethod = EmptyCString();
-  }
-
-  RequestMode
-  Mode() const
-  {
-    return RequestMode::Same_origin;
-  }
-
-  RequestCredentials
-  Credentials() const
-  {
-    return RequestCredentials::Omit;
-  }
-
-  void
-  GetReferrer(DOMString& aReferrer) const
-  {
-    aReferrer.AsAString() = EmptyString();
-  }
-
-  Headers* Headers_() const { return mHeaders; }
-
-  static already_AddRefed<Request>
-  Constructor(const GlobalObject& aGlobal, const RequestOrScalarValueString& aInput,
-              const RequestInit& aInit, ErrorResult& rv);
-
-  nsISupports* GetParentObject() const
-  {
-    return mOwner;
-  }
-
-  already_AddRefed<Request>
-  Clone() const;
-
-  already_AddRefed<Promise>
-  ArrayBuffer(ErrorResult& aRv);
-
-  already_AddRefed<Promise>
-  Blob(ErrorResult& aRv);
-
-  already_AddRefed<Promise>
-  Json(ErrorResult& aRv);
-
-  already_AddRefed<Promise>
-  Text(ErrorResult& aRv);
-
-  bool
-  BodyUsed();
-private:
-  ~Request();
-
-  nsCOMPtr<nsISupports> mOwner;
-  nsRefPtr<Headers> mHeaders;
-};
-
-} // namespace dom
-} // namespace mozilla
-
-#endif // mozilla_dom_Request_h

deleted file mode 100644
--- a/dom/fetch/Response.cpp
+++ /dev/null
@@ -1,134 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "Response.h"
-#include "nsDOMString.h"
-#include "nsPIDOMWindow.h"
-#include "nsIURI.h"
-#include "nsISupportsImpl.h"
-
-#include "mozilla/ErrorResult.h"
-
-using namespace mozilla::dom;
-
-NS_IMPL_CYCLE_COLLECTING_ADDREF(Response)
-NS_IMPL_CYCLE_COLLECTING_RELEASE(Response)
-NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(Response, mOwner)
-
-NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Response)
-  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
-  NS_INTERFACE_MAP_ENTRY(nsISupports)
-NS_INTERFACE_MAP_END
-
-Response::Response(nsISupports* aOwner)
-  : mOwner(aOwner)
-  , mHeaders(new Headers(aOwner))
-{
-  SetIsDOMBinding();
-}
-
-Response::~Response()
-{
-}
-
-/* static */ already_AddRefed<Response>
-Response::Error(const GlobalObject& aGlobal)
-{
-  ErrorResult result;
-  ResponseInit init;
-  init.mStatus = 0;
-  Optional<ArrayBufferOrArrayBufferViewOrScalarValueStringOrURLSearchParams> body;
-  nsRefPtr<Response> r = Response::Constructor(aGlobal, body, init, result);
-  return r.forget();
-}
-
-/* static */ already_AddRefed<Response>
-Response::Redirect(const GlobalObject& aGlobal, const nsAString& aUrl,
-                   uint16_t aStatus)
-{
-  ErrorResult result;
-  ResponseInit init;
-  Optional<ArrayBufferOrArrayBufferViewOrScalarValueStringOrURLSearchParams> body;
-  nsRefPtr<Response> r = Response::Constructor(aGlobal, body, init, result);
-  return r.forget();
-}
-
-/*static*/ already_AddRefed<Response>
-Response::Constructor(const GlobalObject& global,
-                      const Optional<ArrayBufferOrArrayBufferViewOrScalarValueStringOrURLSearchParams>& aBody,
-                      const ResponseInit& aInit, ErrorResult& rv)
-{
-  nsRefPtr<Response> response = new Response(global.GetAsSupports());
-  return response.forget();
-}
-
-already_AddRefed<Response>
-Response::Clone()
-{
-  nsRefPtr<Response> response = new Response(mOwner);
-  return response.forget();
-}
-
-already_AddRefed<Promise>
-Response::ArrayBuffer(ErrorResult& aRv)
-{
-  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(GetParentObject());
-  MOZ_ASSERT(global);
-  nsRefPtr<Promise> promise = Promise::Create(global, aRv);
-  if (aRv.Failed()) {
-    return nullptr;
-  }
-
-  promise->MaybeReject(NS_ERROR_NOT_AVAILABLE);
-  return promise.forget();
-}
-
-already_AddRefed<Promise>
-Response::Blob(ErrorResult& aRv)
-{
-  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(GetParentObject());
-  MOZ_ASSERT(global);
-  nsRefPtr<Promise> promise = Promise::Create(global, aRv);
-  if (aRv.Failed()) {
-    return nullptr;
-  }
-
-  promise->MaybeReject(NS_ERROR_NOT_AVAILABLE);
-  return promise.forget();
-}
-
-already_AddRefed<Promise>
-Response::Json(ErrorResult& aRv)
-{
-  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(GetParentObject());
-  MOZ_ASSERT(global);
-  nsRefPtr<Promise> promise = Promise::Create(global, aRv);
-  if (aRv.Failed()) {
-    return nullptr;
-  }
-
-  promise->MaybeReject(NS_ERROR_NOT_AVAILABLE);
-  return promise.forget();
-}
-
-already_AddRefed<Promise>
-Response::Text(ErrorResult& aRv)
-{
-  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(GetParentObject());
-  MOZ_ASSERT(global);
-  nsRefPtr<Promise> promise = Promise::Create(global, aRv);
-  if (aRv.Failed()) {
-    return nullptr;
-  }
-
-  promise->MaybeReject(NS_ERROR_NOT_AVAILABLE);
-  return promise.forget();
-}
-
-bool
-Response::BodyUsed()
-{
-  return false;
-}

deleted file mode 100644
--- a/dom/fetch/Response.h
+++ /dev/null
@@ -1,107 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef mozilla_dom_Response_h
-#define mozilla_dom_Response_h
-
-#include "nsWrapperCache.h"
-#include "nsISupportsImpl.h"
-
-#include "mozilla/dom/ResponseBinding.h"
-#include "mozilla/dom/UnionTypes.h"
-
-class nsPIDOMWindow;
-
-namespace mozilla {
-namespace dom {
-
-class Headers;
-
-class Response MOZ_FINAL : public nsISupports
-                         , public nsWrapperCache
-{
-  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
-  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(Response)
-
-public:
-  Response(nsISupports* aOwner);
-
-  JSObject*
-  WrapObject(JSContext* aCx)
-  {
-    return ResponseBinding::Wrap(aCx, this);
-  }
-
-  ResponseType
-  Type() const
-  {
-    return ResponseType::Error;
-  }
-
-  void
-  GetUrl(DOMString& aUrl) const
-  {
-    aUrl.AsAString() = EmptyString();
-  }
-
-  uint16_t
-  Status() const
-  {
-    return 400;
-  }
-
-  void
-  GetStatusText(nsCString& aStatusText) const
-  {
-    aStatusText = EmptyCString();
-  }
-
-  Headers*
-  Headers_() const { return mHeaders; }
-
-  static already_AddRefed<Response>
-  Error(const GlobalObject& aGlobal);
-
-  static already_AddRefed<Response>
-  Redirect(const GlobalObject& aGlobal, const nsAString& aUrl, uint16_t aStatus);
-
-  static already_AddRefed<Response>
-  Constructor(const GlobalObject& aGlobal,
-              const Optional<ArrayBufferOrArrayBufferViewOrScalarValueStringOrURLSearchParams>& aBody,
-              const ResponseInit& aInit, ErrorResult& rv);
-
-  nsISupports* GetParentObject() const
-  {
-    return mOwner;
-  }
-
-  already_AddRefed<Response>
-  Clone();
-
-  already_AddRefed<Promise>
-  ArrayBuffer(ErrorResult& aRv);
-
-  already_AddRefed<Promise>
-  Blob(ErrorResult& aRv);
-
-  already_AddRefed<Promise>
-  Json(ErrorResult& aRv);
-
-  already_AddRefed<Promise>
-  Text(ErrorResult& aRv);
-
-  bool
-  BodyUsed();
-private:
-  ~Response();
-
-  nsCOMPtr<nsISupports> mOwner;
-  nsRefPtr<Headers> mHeaders;
-};
-
-} // namespace dom
-} // namespace mozilla
-
-#endif // mozilla_dom_Response_h

--- a/dom/fetch/moz.build
+++ b/dom/fetch/moz.build
@@ -1,24 +1,20 @@
 # -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
 # vim: set filetype=python:
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 EXPORTS.mozilla.dom += [
     'Headers.h',
-    'Request.h',
-    'Response.h',
 ]
 
 UNIFIED_SOURCES += [
     'Headers.cpp',
-    'Request.cpp',
-    'Response.cpp',
 ]
 
 LOCAL_INCLUDES += [
     '../workers',
 ]
 
 FAIL_ON_WARNINGS = True
 MSVC_ENABLE_PGO = True

--- a/dom/tests/mochitest/general/test_interfaces.html
+++ b/dom/tests/mochitest/general/test_interfaces.html
@@ -858,20 +858,16 @@ var interfaceNamesInGlobalScope =
     "RadioNodeList",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "Range",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "RecordErrorEvent",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "Rect",
 // IMPORTANT: Do not change this list without review from a DOM peer!
-    {name: "Request", pref: "dom.fetch.enabled"},
-// IMPORTANT: Do not change this list without review from a DOM peer!
-    {name: "Response", pref: "dom.fetch.enabled"},
-// IMPORTANT: Do not change this list without review from a DOM peer!
     "RGBColor",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     {name: "RTCDataChannelEvent", pref: "media.peerconnection.enabled"},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     {name: "RTCPeerConnectionIceEvent", pref: "media.peerconnection.enabled"},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     {name: "RTCRtpReceiver", pref: "media.peerconnection.enabled"},
 // IMPORTANT: Do not change this list without review from a DOM peer!

deleted file mode 100644
--- a/dom/webidl/Fetch.webidl
+++ /dev/null
@@ -1,36 +0,0 @@
-/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/.
- *
- * The origin of this IDL file is
- * http://fetch.spec.whatwg.org/
- */
-
-typedef object JSON;
-// FIXME(nsm): Bug 1071290: Blobs can't be passed as unions in workers.
-// FIXME(nsm): Bug 739173: FormData is not available in workers.
-// typedef (ArrayBuffer or ArrayBufferView or Blob or FormData or ScalarValueString or URLSearchParams) BodyInit;
-typedef (ArrayBuffer or ArrayBufferView or ScalarValueString or URLSearchParams) BodyInit;
-
-[NoInterfaceObject, Exposed=(Window,Worker)]
-interface Body {
-  readonly attribute boolean bodyUsed;
-  [Throws]
-  Promise<ArrayBuffer> arrayBuffer();
-  [Throws]
-  Promise<Blob> blob();
-  // FIXME(nsm): Bug 739173 FormData is not supported in workers.
-  // Promise<FormData> formData();
-  [Throws]
-  Promise<JSON> json();
-  [Throws]
-  Promise<ScalarValueString> text();
-};
-
-[NoInterfaceObject, Exposed=(Window,Worker)]
-interface GlobalFetch {
-  [Throws, Func="mozilla::dom::Headers::PrefEnabled"]
-  Promise<Response> fetch(RequestInfo input, optional RequestInit init);
-};
-

deleted file mode 100644
--- a/dom/webidl/Request.webidl
+++ /dev/null
@@ -1,38 +0,0 @@
-/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/.
- *
- * The origin of this IDL file is
- * https://fetch.spec.whatwg.org/#request-class
- */
-
-typedef (Request or ScalarValueString) RequestInfo;
-
-[Constructor(RequestInfo input, optional RequestInit init),
- Exposed=(Window,Worker),
- Func="mozilla::dom::Headers::PrefEnabled"]
-interface Request {
-  readonly attribute ByteString method;
-  readonly attribute ScalarValueString url;
-  readonly attribute Headers headers;
-
-  readonly attribute DOMString referrer;
-  readonly attribute RequestMode mode;
-  readonly attribute RequestCredentials credentials;
-
-  Request clone();
-};
-
-Request implements Body;
-
-dictionary RequestInit {
-  ByteString method;
-  HeadersInit headers;
-  BodyInit body;
-  RequestMode mode;
-  RequestCredentials credentials;
-};
-
-enum RequestMode { "same-origin", "no-cors", "cors" };
-enum RequestCredentials { "omit", "same-origin", "include" };

deleted file mode 100644
--- a/dom/webidl/Response.webidl
+++ /dev/null
@@ -1,36 +0,0 @@
-/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/.
- *
- * The origin of this IDL file is
- * https://fetch.spec.whatwg.org/#response-class
- */
-
-[Constructor(optional BodyInit body, optional ResponseInit init),
- Exposed=(Window,Worker),
- Func="mozilla::dom::Headers::PrefEnabled"]
-interface Response {
-  static Response error();
-  static Response redirect(ScalarValueString url, optional unsigned short status = 302);
-
-  readonly attribute ResponseType type;
-
-  readonly attribute ScalarValueString url;
-  readonly attribute unsigned short status;
-  readonly attribute ByteString statusText;
-  readonly attribute Headers headers;
-
-  Response clone();
-};
-
-Response implements Body;
-
-dictionary ResponseInit {
-  unsigned short status = 200;
-  // WebIDL spec doesn't allow default values for ByteString.
-  ByteString statusText;
-  HeadersInit headers;
-};
-
-enum ResponseType { "basic", "cors", "default", "error", "opaque" };

--- a/dom/webidl/Window.webidl
+++ b/dom/webidl/Window.webidl
@@ -460,9 +460,8 @@ interface ChromeWindow {
    *
    * Throws NS_ERROR_NOT_IMPLEMENTED if the OS doesn't support this.
    */
   [Throws, Func="nsGlobalWindow::IsChromeWindow"]
   void beginWindowMove(Event mouseDownEvent, optional Element? panel = null);
 };
 
 Window implements ChromeWindow;
-Window implements GlobalFetch;

--- a/dom/webidl/WorkerGlobalScope.webidl
+++ b/dom/webidl/WorkerGlobalScope.webidl
@@ -33,17 +33,16 @@ partial interface WorkerGlobalScope {
   [Throws]
   void importScripts(DOMString... urls);
 
   readonly attribute WorkerNavigator navigator;
 };
 
 WorkerGlobalScope implements WindowTimers;
 WorkerGlobalScope implements WindowBase64;
-WorkerGlobalScope implements GlobalFetch;
 
 // Not implemented yet: bug 1072107.
 // WorkerGlobalScope implements FontFaceSource;
 
 // Mozilla extensions
 partial interface WorkerGlobalScope {
   attribute EventHandler onclose;
 

--- a/dom/webidl/moz.build
+++ b/dom/webidl/moz.build
@@ -119,17 +119,16 @@ WEBIDL_FILES = [
     'DynamicsCompressorNode.webidl',
     'Element.webidl',
     'EngineeringMode.webidl',
     'Event.webidl',
     'EventHandler.webidl',
     'EventListener.webidl',
     'EventSource.webidl',
     'EventTarget.webidl',
-    'Fetch.webidl',
     'File.webidl',
     'FileList.webidl',
     'FileMode.webidl',
     'FileReader.webidl',
     'FileReaderSync.webidl',
     'FocusEvent.webidl',
     'FontFace.webidl',
     'FontFaceSet.webidl',
@@ -322,20 +321,18 @@ WEBIDL_FILES = [
     'ProcessingInstruction.webidl',
     'ProfileTimelineMarker.webidl',
     'Promise.webidl',
     'PromiseDebugging.webidl',
     'PushManager.webidl',
     'RadioNodeList.webidl',
     'Range.webidl',
     'Rect.webidl',
-    'Request.webidl',
     'ResourceStats.webidl',
     'ResourceStatsManager.webidl',
-    'Response.webidl',
     'RGBColor.webidl',
     'RTCConfiguration.webidl',
     'RTCIceCandidate.webidl',
     'RTCIdentityAssertion.webidl',
     'RTCPeerConnection.webidl',
     'RTCPeerConnectionStatic.webidl',
     'RTCRtpReceiver.webidl',
     'RTCRtpSender.webidl',

--- a/dom/workers/WorkerScope.cpp
+++ b/dom/workers/WorkerScope.cpp
@@ -298,24 +298,16 @@ WorkerGlobalScope::GetPerformance()
 
   if (!mPerformance) {
     mPerformance = new Performance(mWorkerPrivate);
   }
 
   return mPerformance;
 }
 
-already_AddRefed<Promise>
-WorkerGlobalScope::Fetch(const RequestOrScalarValueString& aInput,
-                         const RequestInit& aInit, ErrorResult& aRv)
-{
-  aRv.Throw(NS_ERROR_NOT_IMPLEMENTED);
-  return nullptr;
-}
-
 DedicatedWorkerGlobalScope::DedicatedWorkerGlobalScope(WorkerPrivate* aWorkerPrivate)
 : WorkerGlobalScope(aWorkerPrivate)
 {
 }
 
 JSObject*
 DedicatedWorkerGlobalScope::WrapGlobalObject(JSContext* aCx)
 {

--- a/dom/workers/WorkerScope.h
+++ b/dom/workers/WorkerScope.h
@@ -3,18 +3,16 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #ifndef mozilla_dom_workerscope_h__
 #define mozilla_dom_workerscope_h__
 
 #include "Workers.h"
 #include "mozilla/DOMEventTargetHelper.h"
-#include "mozilla/dom/RequestBinding.h"
-#include "mozilla/dom/UnionTypes.h"
 
 namespace mozilla {
 namespace dom {
 
 class Console;
 class Function;
 class Promise;
 
@@ -117,19 +115,16 @@ public:
   IMPL_EVENT_HANDLER(online)
   IMPL_EVENT_HANDLER(offline)
   IMPL_EVENT_HANDLER(close)
 
   void
   Dump(const Optional<nsAString>& aString) const;
 
   Performance* GetPerformance();
-
-  already_AddRefed<Promise>
-  Fetch(const RequestOrScalarValueString& aInput, const RequestInit& aInit, ErrorResult& aRv);
 };
 
 class DedicatedWorkerGlobalScope MOZ_FINAL : public WorkerGlobalScope
 {
   ~DedicatedWorkerGlobalScope() { }
 
 public:
   explicit DedicatedWorkerGlobalScope(WorkerPrivate* aWorkerPrivate);

--- a/dom/workers/moz.build
+++ b/dom/workers/moz.build
@@ -81,16 +81,15 @@ include('/ipc/chromium/chromium-config.m
 FINAL_LIBRARY = 'xul'
 
 TEST_DIRS += [
     'test/extensions/bootstrap',
     'test/extensions/traditional',
 ]
 
 MOCHITEST_MANIFESTS += [
-    'test/fetch/mochitest.ini',
     'test/mochitest.ini',
     'test/serviceworkers/mochitest.ini',
 ]
 
 MOCHITEST_CHROME_MANIFESTS += ['test/chrome.ini']
 
 XPCSHELL_TESTS_MANIFESTS += ['test/xpcshell/xpcshell.ini']

deleted file mode 100644
--- a/dom/workers/test/fetch/mochitest.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[DEFAULT]
-support-files =
-  worker_interfaces.js
-
-[test_interfaces.html]

deleted file mode 100644
--- a/dom/workers/test/fetch/moz.build
+++ /dev/null
@@ -1,7 +0,0 @@
-# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
-# vim: set filetype=python:
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-MOCHITEST_MANIFESTS += ['mochitest.ini']

deleted file mode 100644
--- a/dom/workers/test/fetch/test_interfaces.html
+++ /dev/null
@@ -1,48 +0,0 @@
-<!--
-  Any copyright is dedicated to the Public Domain.
-  http://creativecommons.org/publicdomain/zero/1.0/
--->
-<!DOCTYPE HTML>
-<html>
-<head>
-  <title>Bug 1017613 - Test fetch API interfaces</title>
-  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
-  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
-</head>
-<body>
-<p id="display"></p>
-<div id="content" style="display: none"></div>
-<pre id="test"></pre>
-<script class="testbody" type="text/javascript">
-
-  function checkEnabled() {
-    var worker = new Worker("worker_interfaces.js");
-    worker.onmessage = function(event) {
-
-      if (event.data.type == 'finish') {
-        SimpleTest.finish();
-      } else if (event.data.type == 'status') {
-        ok(event.data.status, event.data.msg);
-      }
-    }
-
-    worker.onerror = function(event) {
-      ok(false, "Worker had an error: " + event.data);
-      SimpleTest.finish();
-    };
-
-    worker.postMessage(true);
-  }
-
-  SimpleTest.waitForExplicitFinish();
-
-  SpecialPowers.pushPrefEnv({"set": [
-    ["dom.fetch.enabled", true]
-  ]}, function() {
-    checkEnabled();
-  });
-</script>
-</pre>
-</body>
-</html>
-

deleted file mode 100644
--- a/dom/workers/test/fetch/worker_interfaces.js
+++ /dev/null
@@ -1,12 +0,0 @@
-function ok(a, msg) {
-  dump("OK: " + !!a + "  =>  " + a + " " + msg + "\n");
-  postMessage({type: 'status', status: !!a, msg: a + ": " + msg });
-}
-
-onmessage = function() {
-  ok(typeof Headers === "function", "Headers should be defined");
-  ok(typeof Request === "function", "Request should be defined");
-  ok(typeof Response === "function", "Response should be defined");
-  ok(typeof fetch === "function", "fetch() should be defined");
-  postMessage({ type: 'finish' });
-}