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

Source/WebCore/Modules/mediastream/RTCDTMFToneChangeEvent.cpp

 /*
  * Copyright (C) 2013 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 32 matching lines @@
 }
 
 PassRefPtr<RTCDTMFToneChangeEvent> RTCDTMFToneChangeEvent::create(const AtomicString& type, const RTCDTMFToneChangeEventInit& initializer)
 {
     ASSERT(type == eventNames().tonechangeEvent);
     return adoptRef(new RTCDTMFToneChangeEvent(initializer));
 }
 
 RTCDTMFToneChangeEvent::RTCDTMFToneChangeEvent()
 {
+    ScriptWrappable::init(this);
 }
 
 RTCDTMFToneChangeEvent::RTCDTMFToneChangeEvent(const String& tone)
     : Event(eventNames().tonechangeEvent, false, false)
     , m_tone(tone)
 {
+    ScriptWrappable::init(this);
 }
 
 RTCDTMFToneChangeEvent::RTCDTMFToneChangeEvent(const RTCDTMFToneChangeEventInit& initializer)
     : Event(eventNames().tonechangeEvent, initializer)
     , m_tone(initializer.tone)
 {
+    ScriptWrappable::init(this);
 }
 
 RTCDTMFToneChangeEvent::~RTCDTMFToneChangeEvent()
 {
 }
 
 const String& RTCDTMFToneChangeEvent::tone() const
 {
     return m_tone;
 }
 
 const AtomicString& RTCDTMFToneChangeEvent::interfaceName() const
 {
     return eventNames().interfaceForRTCDTMFToneChangeEvent;
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(MEDIA_STREAM)