--- a/dom/base/DOMParser.cpp
+++ b/dom/base/DOMParser.cpp
@@ -43,17 +43,16 @@ DOMParser::DOMParser(nsIGlobalObject* aO
 DOMParser::~DOMParser()
 {
 }
 
 // QueryInterface implementation for DOMParser
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DOMParser)
   NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
   NS_INTERFACE_MAP_ENTRY(nsISupports)
-  NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
 NS_INTERFACE_MAP_END
 
 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(DOMParser, mOwner)
 
 NS_IMPL_CYCLE_COLLECTING_ADDREF(DOMParser)
 NS_IMPL_CYCLE_COLLECTING_RELEASE(DOMParser)
 
 static const char*

--- a/dom/base/DOMParser.h
+++ b/dom/base/DOMParser.h
@@ -4,30 +4,29 @@
  * 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_DOMParser_h_
 #define mozilla_dom_DOMParser_h_
 
 #include "nsCOMPtr.h"
 #include "nsIDocument.h"
-#include "nsWeakReference.h"
 #include "nsWrapperCache.h"
 #include "mozilla/ErrorResult.h"
 #include "mozilla/Span.h"
 #include "mozilla/dom/DOMParserBinding.h"
 #include "mozilla/dom/TypedArray.h"
 
 class nsIDocument;
 class nsIGlobalObject;
 
 namespace mozilla {
 namespace dom {
 
-class DOMParser final : public nsSupportsWeakReference,
+class DOMParser final : public nsISupports,
                         public nsWrapperCache
 {
   typedef mozilla::dom::GlobalObject GlobalObject;
 
   virtual ~DOMParser();
 
 public:
   NS_DECL_CYCLE_COLLECTING_ISUPPORTS