--- a/dom/base/nsDOMClassInfo.cpp
+++ b/dom/base/nsDOMClassInfo.cpp
@@ -251,17 +251,16 @@ using mozilla::dom::workers::ResolveWork
 #include "BluetoothDevice.h"
 #endif
 
 #include "DOMCameraManager.h"
 #include "DOMCameraControl.h"
 #include "DOMCameraCapabilities.h"
 #include "nsIOpenWindowEventDetail.h"
 #include "nsIAsyncScrollEventDetail.h"
-#include "nsIDOMGlobalObjectConstructor.h"
 #include "nsIDOMCanvasRenderingContext2D.h"
 #include "LockedFile.h"
 #include "nsDebug.h"
 
 #include "mozilla/dom/BindingUtils.h"
 #include "mozilla/Likely.h"
 
 #ifdef MOZ_TIME_MANAGER
@@ -2724,86 +2723,32 @@ BaseStubConstructor(nsIWeakReference* aW
     native = do_CreateInstance(*name_struct->mData->mConstructorCID, &rv);
   }
   if (NS_FAILED(rv)) {
     NS_ERROR("Failed to create the object");
     return rv;
   }
 
   nsCOMPtr<nsIJSNativeInitializer> initializer(do_QueryInterface(native));
-  nsCOMPtr<nsIDOMGlobalObjectConstructor> constructor(do_QueryInterface(native));
-  if (initializer || constructor) {
+  if (initializer) {
     // Initialize object using the current inner window, but only if
     // the caller can access it.
     nsCOMPtr<nsPIDOMWindow> owner = do_QueryReferent(aWeakOwner);
     nsPIDOMWindow* outerWindow = owner ? owner->GetOuterWindow() : nullptr;
     nsPIDOMWindow* currentInner =
       outerWindow ? outerWindow->GetCurrentInnerWindow() : nullptr;
     if (!currentInner ||
         (owner != currentInner &&
          !nsContentUtils::CanCallerAccess(currentInner))) {
       return NS_ERROR_DOM_SECURITY_ERR;
     }
 
-    if (initializer) {
-      rv = initializer->Initialize(currentInner, cx, obj, args);
-      if (NS_FAILED(rv)) {
-        return rv;
-      }
-    } else {
-      nsCOMPtr<nsIXPConnectWrappedJS> wrappedJS = do_QueryInterface(native);
-
-      JS::Rooted<JSObject*> thisObject(cx, wrappedJS->GetJSObject());
-      if (!thisObject) {
-        return NS_ERROR_UNEXPECTED;
-      }
-
-      nsCxPusher pusher;
-      pusher.Push(cx);
-
-      JSAutoCompartment ac(cx, thisObject);
-
-      JS::Rooted<JS::Value> funval(cx);
-      if (!JS_GetProperty(cx, thisObject, "constructor", &funval) ||
-          !funval.isObject()) {
-        return NS_ERROR_UNEXPECTED;
-      }
-
-      // Check if the object is even callable.
-      NS_ENSURE_STATE(JS_ObjectIsCallable(cx, &funval.toObject()));
-      {
-        // wrap parameters in the target compartment
-        // we also pass in the calling window as the first argument
-        unsigned argc = args.length() + 1;
-        nsAutoArrayPtr<JS::Value> argv(new JS::Value[argc]);
-        JS::AutoArrayRooter rooter(cx, 0, argv);
-
-        nsCOMPtr<nsIXPConnectJSObjectHolder> holder;
-        nsCOMPtr<nsIDOMWindow> currentWin(do_GetInterface(currentInner));
-        rv = WrapNative(cx, obj, currentWin, &NS_GET_IID(nsIDOMWindow),
-                        true, &argv[0], getter_AddRefs(holder));
-        if (!JS_WrapValue(cx, &argv[0]))
-          return NS_ERROR_FAILURE;
-        rooter.changeLength(1);
-
-        for (size_t i = 1; i < argc; ++i) {
-          argv[i] = args[i - 1];
-          if (!JS_WrapValue(cx, &argv[i]))
-            return NS_ERROR_FAILURE;
-          rooter.changeLength(i + 1);
-        }
-
-        JS::Rooted<JS::Value> frval(cx);
-        bool ret = JS_CallFunctionValue(cx, thisObject, funval, argc, argv,
-                                        frval.address());
-
-        if (!ret) {
-          return NS_ERROR_FAILURE;
-        }
-      }
+    rv = initializer->Initialize(currentInner, cx, obj, args);
+    if (NS_FAILED(rv)) {
+      return rv;
     }
   }
 
   return WrapNative(cx, obj, native, true, args.rval().address());
 }
 
 static nsresult
 DefineInterfaceConstants(JSContext *cx, JS::Handle<JSObject*> obj, const nsIID *aIID)

--- a/dom/interfaces/base/moz.build
+++ b/dom/interfaces/base/moz.build
@@ -11,17 +11,16 @@ XPIDL_SOURCES += [
     'nsIContentPrefService.idl',
     'nsIContentPrefService2.idl',
     'nsIContentURIGrouper.idl',
     'nsIDOMCRMFObject.idl',
     'nsIDOMChromeWindow.idl',
     'nsIDOMClientRect.idl',
     'nsIDOMClientRectList.idl',
     'nsIDOMConstructor.idl',
-    'nsIDOMGlobalObjectConstructor.idl',
     'nsIDOMGlobalPropertyInitializer.idl',
     'nsIDOMHistory.idl',
     'nsIDOMJSWindow.idl',
     'nsIDOMLocation.idl',
     'nsIDOMMediaQueryList.idl',
     'nsIDOMModalContentWindow.idl',
     'nsIDOMNavigator.idl',
     'nsIDOMPkcs11.idl',

deleted file mode 100644
--- a/dom/interfaces/base/nsIDOMGlobalObjectConstructor.idl
+++ /dev/null
@@ -1,19 +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/. */
-
-#include "domstubs.idl"
-
-[scriptable, uuid(cb439c73-0129-4289-a349-c5216e6b912a)]
-interface nsIDOMGlobalObjectConstructor : nsISupports
-{
-  /*
-   * JS use only
-   *
-   * The constructor() method will be called with any parameters passed
-   * to the object constructor.
-   * If the JS implementation returns a value, it will be ignored.
-   */
-  void constructor();
-};