Add WebKit prefix to MediaSource,SourceBuffer, and SourceBufferList objects.

Source/core/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 282 matching lines @@
     attribute MutationObserverConstructor WebKitMutationObserver; // FIXME: Add metrics to determine when we can remove this.
     attribute IDBCursorConstructor webkitIDBCursor;
     attribute IDBDatabaseConstructor webkitIDBDatabase;
     attribute IDBFactoryConstructor webkitIDBFactory;
     attribute IDBIndexConstructor webkitIDBIndex;
     attribute IDBKeyRangeConstructor webkitIDBKeyRange;
     attribute IDBObjectStoreConstructor webkitIDBObjectStore;
     attribute IDBRequestConstructor webkitIDBRequest;
     attribute IDBTransactionConstructor webkitIDBTransaction;
 
+    [EnabledAtRuntime=webKitMediaSource] attribute WebKitMediaSourceConstructor WebKitMediaSource;
+    [EnabledAtRuntime=webKitMediaSource] attribute WebKitSourceBufferConstructor WebKitSourceBuffer;
+    [EnabledAtRuntime=webKitMediaSource] attribute WebKitSourceBufferListConstructor WebKitSourceBufferList;
+
     // Constructors enabled at runtime but whose interface does not have EnabledAtRuntime
     // extended attribute.
     // FIXME: Remove these.
     [EnabledAtRuntime=media] attribute HTMLMediaElementConstructor HTMLMediaElement;
     [EnabledAtRuntime=media] attribute HTMLVideoElementConstructor HTMLVideoElement;
     [EnabledAtRuntime=media] attribute MediaErrorConstructor MediaError;
     [EnabledAtRuntime=media] attribute TimeRangesConstructor TimeRanges;
     [EnabledAtRuntime=media] attribute HTMLSourceElementConstructor HTMLSourceElement;
     [EnabledAtRuntime=media] attribute MediaControllerConstructor MediaController;
     [EnabledAtRuntime=deviceMotion] attribute DeviceMotionEventConstructor DeviceMotionEvent;
@@ skipping 10 matching lines @@
     [EnabledAtRuntime] attribute SharedWorkerConstructor SharedWorker; // Usable with the new operator
     [EnabledAtRuntime=scriptedSpeech] attribute SpeechGrammarConstructor webkitSpeechGrammar;
     [EnabledAtRuntime=scriptedSpeech] attribute SpeechGrammarListConstructor webkitSpeechGrammarList;
     [EnabledAtRuntime=scriptedSpeech] attribute SpeechRecognitionConstructor webkitSpeechRecognition;
     [EnabledAtRuntime=scriptedSpeech] attribute SpeechRecognitionErrorConstructor webkitSpeechRecognitionError;
     [EnabledAtRuntime=scriptedSpeech] attribute SpeechRecognitionEventConstructor webkitSpeechRecognitionEvent;
 
     // Constructors whose name does not match the interface name.
     // FIXME: Remove these once [ImplementedAs] is used and once constructor names match interface names.
     attribute ShadowRootConstructor WebKitShadowRoot;
-    [EnabledAtRuntime=mediaSource] attribute MediaSourceConstructor WebKitMediaSource;
-    [EnabledAtRuntime=mediaSource] attribute SourceBufferConstructor WebKitSourceBuffer;
-    [EnabledAtRuntime=mediaSource] attribute SourceBufferListConstructor WebKitSourceBufferList;
     [Conditional=WEB_AUDIO] attribute PannerNodeConstructor webkitAudioPannerNode;
 
     // window.toString() requires special handling in V8
     [DoNotCheckSignature, DoNotCheckSecurity, Custom, NotEnumerable] DOMString toString();
 };