Reduce repetitive EventTarget subclassing

Source/modules/webaudio/AudioNode.h

Index: Source/modules/webaudio/AudioNode.h
diff --git a/Source/modules/webaudio/AudioNode.h b/Source/modules/webaudio/AudioNode.h
index 12699d843dfd071f9cddbd78c73de0df1a7d0378..d2917ab36a44917d51cd44291e6ae54208e18d47 100644
--- a/Source/modules/webaudio/AudioNode.h
+++ b/Source/modules/webaudio/AudioNode.h
@@ -50,7 +50,7 @@ class ExceptionState;
 // An AudioDestinationNode has one input and no outputs and represents the final destination to the audio hardware.
 // Most processing nodes such as filters will have one input and one output, although multiple inputs and outputs are possible.
 
-class AudioNode : public ScriptWrappable, public EventTarget {
+class AudioNode : public ScriptWrappable, public EventTargetWithInlineData {
 public:
     enum { ProcessingSizeInFrames = 128 };
 
@@ -182,8 +182,6 @@ public:
     // EventTarget
     virtual const AtomicString& interfaceName() const OVERRIDE;
     virtual ScriptExecutionContext* scriptExecutionContext() const OVERRIDE;
-    virtual EventTargetData* eventTargetData() OVERRIDE { return &m_eventTargetData; }
-    virtual EventTargetData* ensureEventTargetData() OVERRIDE { return &m_eventTargetData; }
 
 protected:
     // Inputs and outputs must be created before the AudioNode is initialized.
@@ -206,8 +204,6 @@ private:
     Vector<OwnPtr<AudioNodeInput> > m_inputs;
     Vector<OwnPtr<AudioNodeOutput> > m_outputs;
 
-    EventTargetData m_eventTargetData;
-
     double m_lastProcessingTime;
     double m_lastNonSilentTime;