Deprecate webkitRequestAnimationFrame and friends as vendor-specific

Source/core/frame/Window.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 154 matching lines @@
 
     [Replaceable] readonly attribute Console console;
 
     // cross-document messaging
     [DoNotCheckSecurity, Custom, RaisesException] void postMessage(SerializedScriptValue message, DOMString targetOrigin, optional MessagePort[] messagePorts);
 
     [Replaceable] readonly attribute Performance performance;
 
     [MeasureAs=UnprefixedRequestAnimationFrame] long requestAnimationFrame(RequestAnimationFrameCallback callback);
     void cancelAnimationFrame(long id);
-    [MeasureAs=PrefixedRequestAnimationFrame] long webkitRequestAnimationFrame(RequestAnimationFrameCallback callback);
-    [ImplementedAs=cancelAnimationFrame] void webkitCancelAnimationFrame(long id);
-    [ImplementedAs=cancelAnimationFrame] void webkitCancelRequestAnimationFrame(long id); // This is a deprecated alias for webkitCancelAnimationFrame(). Remove this when removing vendor prefix.
+    [DeprecateAs=PrefixedRequestAnimationFrame] long webkitRequestAnimationFrame(RequestAnimationFrameCallback callback);
+    [DeprecateAs=PrefixedCancelAnimationFrame, ImplementedAs=cancelAnimationFrame] void webkitCancelAnimationFrame(long id);
+    [DeprecateAs=PrefixedCancelRequestAnimationFrame, ImplementedAs=cancelAnimationFrame] void webkitCancelRequestAnimationFrame(long id);
 
     [Replaceable] readonly attribute CSS CSS;
 
     // Event handler attributes
     [RuntimeEnabled=CSSAnimationUnprefixed] attribute EventHandler onanimationend;
     [RuntimeEnabled=CSSAnimationUnprefixed] attribute EventHandler onanimationiteration;
     [RuntimeEnabled=CSSAnimationUnprefixed] attribute EventHandler onanimationstart;
     [RuntimeEnabled=OrientationEvent] attribute EventHandler onorientationchange;
     attribute EventHandler onsearch;
     [RuntimeEnabled=Touch] attribute EventHandler ontouchcancel;
@@ skipping 53 matching lines @@
 
     [NotEnumerable] getter Window (unsigned long index);
     [Custom, NotEnumerable] getter Window (DOMString name);
 };
 
 Window implements GlobalEventHandlers;
 Window implements ImageBitmapFactories;
 Window implements WindowBase64;
 Window implements WindowEventHandlers;
 Window implements WindowTimers;