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

Source/WebCore/Modules/mediastream/MediaStreamTrackEvent.cpp

 /*
  * Copyright (C) 2012 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 27 matching lines @@
 }
 
 PassRefPtr<MediaStreamTrackEvent> MediaStreamTrackEvent::create(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtr<MediaStreamTrack> track)
 {
     return adoptRef(new MediaStreamTrackEvent(type, canBubble, cancelable, track));
 }
 
 
 MediaStreamTrackEvent::MediaStreamTrackEvent()
 {
+    ScriptWrappable::init(this);
 }
 
 MediaStreamTrackEvent::MediaStreamTrackEvent(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtr<MediaStreamTrack> track)
     : Event(type, canBubble, cancelable)
     , m_track(track)
 {
+    ScriptWrappable::init(this);
 }
 
 MediaStreamTrackEvent::~MediaStreamTrackEvent()
 {
 }
 
 MediaStreamTrack* MediaStreamTrackEvent::track() const
 {
     return m_track.get();
 }
 
 const AtomicString& MediaStreamTrackEvent::interfaceName() const
 {
     return eventNames().interfaceForMediaStreamTrackEvent;
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(MEDIA_STREAM)