Reduce repetitive EventTarget subclassing

Source/modules/speech/SpeechSynthesisUtterance.h

Index: Source/modules/speech/SpeechSynthesisUtterance.h
diff --git a/Source/modules/speech/SpeechSynthesisUtterance.h b/Source/modules/speech/SpeechSynthesisUtterance.h
index 433c14916d03c1ee9b8baa3d95ab9a6a32ec634f..79645aa0cd3f48f4b7e568a417ddd24094cbd533 100644
--- a/Source/modules/speech/SpeechSynthesisUtterance.h
+++ b/Source/modules/speech/SpeechSynthesisUtterance.h
@@ -36,7 +36,7 @@
 
 namespace WebCore {
 
-class SpeechSynthesisUtterance : public PlatformSpeechSynthesisUtteranceClient, public ScriptWrappable, public RefCounted<SpeechSynthesisUtterance>, public ContextLifecycleObserver, public EventTarget {
+class SpeechSynthesisUtterance : public PlatformSpeechSynthesisUtteranceClient, public ScriptWrappable, public RefCounted<SpeechSynthesisUtterance>, public ContextLifecycleObserver, public EventTargetWithInlineData {
 public:
     static PassRefPtr<SpeechSynthesisUtterance> create(ScriptExecutionContext*, const String&);
 
@@ -84,13 +84,9 @@ private:
     RefPtr<SpeechSynthesisVoice> m_voice;
 
     // EventTarget
-    EventTargetData m_eventTargetData;
-
     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