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

Source/WebCore/html/MediaKeyEvent.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 23 matching lines @@
 
 namespace WebCore {
 
 MediaKeyEventInit::MediaKeyEventInit()
     : systemCode(0)
 {
 }
 
 MediaKeyEvent::MediaKeyEvent()
 {
+    ScriptWrappable::init(this);
 }
 
 MediaKeyEvent::MediaKeyEvent(const AtomicString& type, const MediaKeyEventInit& initializer)
     : Event(type, initializer)
     , m_keySystem(initializer.keySystem)
     , m_sessionId(initializer.sessionId)
     , m_initData(initializer.initData)
     , m_message(initializer.message)
     , m_defaultURL(initializer.defaultURL)
     , m_errorCode(initializer.errorCode)
     , m_systemCode(initializer.systemCode)
 {
+    ScriptWrappable::init(this);
 }
 
 MediaKeyEvent::~MediaKeyEvent()
 {
 }
 
 const AtomicString& MediaKeyEvent::interfaceName() const
 {
     return eventNames().interfaceForMediaKeyEvent;
 }
 
 } // namespace WebCore
 
 #endif