Reduce repetitive EventTarget subclassing

Source/modules/mediastream/RTCDTMFSender.h

 /*
  * 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 22 matching lines @@
 #include "platform/Timer.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
 class ExceptionState;
 class MediaStreamTrack;
 class RTCDTMFSenderHandler;
 class RTCPeerConnectionHandler;
 
-class RTCDTMFSender : public RefCounted<RTCDTMFSender>, public ScriptWrappable, public EventTarget, public RTCDTMFSenderHandlerClient, public ActiveDOMObject {
+class RTCDTMFSender : public RefCounted<RTCDTMFSender>, public ScriptWrappable, public EventTargetWithInlineData, public RTCDTMFSenderHandlerClient, public ActiveDOMObject {
 public:
     static PassRefPtr<RTCDTMFSender> create(ScriptExecutionContext*, RTCPeerConnectionHandler*, PassRefPtr<MediaStreamTrack>, ExceptionState&);
     ~RTCDTMFSender();
 
     bool canInsertDTMF() const;
     MediaStreamTrack* track() const;
     String toneBuffer() const;
     long duration() const { return m_duration; }
     long interToneGap() const { return m_interToneGap; }
 
@@ skipping 13 matching lines @@
     using RefCounted<RTCDTMFSender>::ref;
     using RefCounted<RTCDTMFSender>::deref;
 
 private:
     RTCDTMFSender(ScriptExecutionContext*, PassRefPtr<MediaStreamTrack>, PassOwnPtr<RTCDTMFSenderHandler>);
 
     void scheduleDispatchEvent(PassRefPtr<Event>);
     void scheduledEventTimerFired(Timer<RTCDTMFSender>*);
 
     // EventTarget
-    virtual EventTargetData* eventTargetData() OVERRIDE;
-    virtual EventTargetData* ensureEventTargetData() OVERRIDE;
     virtual void refEventTarget() OVERRIDE { ref(); }
     virtual void derefEventTarget() OVERRIDE { deref(); }
-    EventTargetData m_eventTargetData;
 
     // RTCDTMFSenderHandlerClient
     virtual void didPlayTone(const String&) OVERRIDE;
 
     RefPtr<MediaStreamTrack> m_track;
     long m_duration;
     long m_interToneGap;
 
     OwnPtr<RTCDTMFSenderHandler> m_handler;
 
     bool m_stopped;
 
     Timer<RTCDTMFSender> m_scheduledEventTimer;
     Vector<RefPtr<Event> > m_scheduledEvents;
 };
 
 } // namespace WebCore
 
 #endif // RTCDTMFSender_h