First part of work to move V8 binding integrity off of vtables.

Source/WebCore/Modules/mediastream/MediaStreamEvent.cpp

 /*
  * 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
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 36 matching lines @@
     return adoptRef(new MediaStreamEvent(type, canBubble, cancelable, stream));
 }
 
 PassRefPtr<MediaStreamEvent> MediaStreamEvent::create(const AtomicString& type, const MediaStreamEventInit& initializer)
 {
     return adoptRef(new MediaStreamEvent(type, initializer));
 }
 
 MediaStreamEvent::MediaStreamEvent()
 {
+    ScriptWrappable::init(this);
 }
 
 MediaStreamEvent::MediaStreamEvent(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtr<MediaStream> stream)
     : Event(type, canBubble, cancelable)
     , m_stream(stream)
 {
+    ScriptWrappable::init(this);
 }
 
 MediaStreamEvent::MediaStreamEvent(const AtomicString& type, const MediaStreamEventInit& initializer)
     : Event(type, initializer)
     , m_stream(initializer.stream)
 {
+    ScriptWrappable::init(this);
 }
 
 MediaStreamEvent::~MediaStreamEvent()
 {
 }
 
 MediaStream* MediaStreamEvent::stream() const
 {
     return m_stream.get();
 }
 
 const AtomicString& MediaStreamEvent::interfaceName() const
 {
     return eventNames().interfaceForMediaStreamEvent;
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(MEDIA_STREAM)