Inherit EventTarget interface instead of duplicating its code

Source/core/html/MediaController.h

 /*
  * Copyright (C) 2011 Apple 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 24 matching lines @@
 #include "wtf/RefCounted.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class Clock;
 class HTMLMediaElement;
 class Event;
 class ScriptExecutionContext;
 
-class MediaController : public RefCounted<MediaController>, public ScriptWrappable, public MediaControllerInterface, public EventTarget {
+class MediaController : public EventTarget, public RefCounted<MediaController>, public ScriptWrappable, public MediaControllerInterface {
 public:
     static PassRefPtr<MediaController> create(ScriptExecutionContext*);
     virtual ~MediaController();
 
     void addMediaElement(HTMLMediaElement*);
     void removeMediaElement(HTMLMediaElement*);
     bool containsMediaElement(HTMLMediaElement*) const;
 
     const String& mediaGroup() const { return m_mediaGroup; }
 
@@ skipping 91 matching lines @@
     bool m_closedCaptionsVisible;
     PassRefPtr<Clock> m_clock;
     ScriptExecutionContext* m_scriptExecutionContext;
     Timer<MediaController> m_timeupdateTimer;
     double m_previousTimeupdateTime;
 };
 
 } // namespace WebCore
 
 #endif