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

Source/WebCore/Modules/encryptedmedia/MediaKeyMessageEvent.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 18 matching lines @@
 
 #include "MediaKeyMessageEvent.h"
 
 #include "EventNames.h"
 #include <wtf/Uint8Array.h>
 
 namespace WebCore {
 
 MediaKeyMessageEventInit::MediaKeyMessageEventInit()
 {
+    ScriptWrappable::init(this);
 }
 
 MediaKeyMessageEvent::MediaKeyMessageEvent()
 {
+    ScriptWrappable::init(this);
 }
 
 MediaKeyMessageEvent::MediaKeyMessageEvent(const AtomicString& type, const MediaKeyMessageEventInit& initializer)
     : Event(type, initializer)
     , m_message(initializer.message)
     , m_destinationURL(initializer.destinationURL)
 {
+    ScritpWrappable::init(this);
 }
 
 MediaKeyMessageEvent::~MediaKeyMessageEvent()
 {
 }
 
 const AtomicString& MediaKeyMessageEvent::interfaceName() const
 {
     return eventNames().interfaceForMediaKeyMessageEvent;
 }
 
 } // namespace WebCore
 
 #endif