Inherit EventTarget interface instead of duplicating its code

Source/modules/speech/SpeechSynthesisUtterance.h

 /*
  * Copyright (C) 2013 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 18 matching lines @@
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/dom/EventTarget.h"
 #include "core/platform/PlatformSpeechSynthesisUtterance.h"
 #include "modules/speech/SpeechSynthesisVoice.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
-class SpeechSynthesisUtterance : public PlatformSpeechSynthesisUtteranceClient, public ScriptWrappable, public RefCounted<SpeechSynthesisUtterance>, public ContextLifecycleObserver, public EventTarget {
+class SpeechSynthesisUtterance : public EventTarget, public PlatformSpeechSynthesisUtteranceClient, public ScriptWrappable, public RefCounted<SpeechSynthesisUtterance>, public ContextLifecycleObserver {
 public:
     static PassRefPtr<SpeechSynthesisUtterance> create(ScriptExecutionContext*, const String&);
 
     ~SpeechSynthesisUtterance();
 
     const String& text() const { return m_platformUtterance->text(); }
     void setText(const String& text) { m_platformUtterance->setText(text); }
 
     const String& lang() const { return m_platformUtterance->lang(); }
     void setLang(const String& lang) { m_platformUtterance->setLang(lang); }
@@ skipping 39 matching lines @@
     virtual const AtomicString& interfaceName() const OVERRIDE;
     virtual void refEventTarget() OVERRIDE { ref(); }
     virtual void derefEventTarget() OVERRIDE { deref(); }
     virtual EventTargetData* eventTargetData() OVERRIDE { return &m_eventTargetData; }
     virtual EventTargetData* ensureEventTargetData() OVERRIDE { return &m_eventTargetData; }
 };
 
 } // namespace WebCore
 
 #endif // SpeechSynthesisUtterance_h