Merge 143386

Source/WebCore/page/DOMWindow.idl

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 781 matching lines @@
 #endif
 
     attribute DOMFormDataConstructor FormData;
 
     [Conditional=BLOB|FILE_SYSTEM] attribute FileErrorConstructor FileError;
     [Conditional=BLOB] attribute FileReaderConstructor FileReader;
 
     [Conditional=BLOB] attribute DOMURLConstructor URL;
     [Conditional=BLOB] attribute DOMURLConstructor webkitURL; // FIXME: deprecate this.
 
-    attribute MutationObserverConstructor WebKitMutationObserver;
+    attribute MutationObserverConstructor WebKitMutationObserver; // FIXME: Add metrics to determine when we can remove this.
+    attribute MutationObserverConstructor MutationObserver;
 
     [Conditional=MEDIA_SOURCE, V8EnabledAtRuntime=mediaSource] attribute MediaSourceConstructor WebKitMediaSource;
     [Conditional=MEDIA_SOURCE, V8EnabledAtRuntime=mediaSource] attribute SourceBufferConstructor WebKitSourceBuffer;
     [Conditional=MEDIA_SOURCE, V8EnabledAtRuntime=mediaSource] attribute SourceBufferListConstructor WebKitSourceBufferList;
 
 #endif // defined(LANGUAGE_JAVASCRIPT)
 
 #if defined(V8_BINDING) && V8_BINDING
     // window.toString() requires special handling in V8
     [V8DoNotCheckSignature, DoNotCheckSecurity, Custom, NotEnumerable] DOMString toString();
 #endif // defined(V8_BINDING)
 };