Reduce repetitive EventTarget subclassing

Source/modules/webaudio/AudioContext.h

 /*
  * Copyright (C) 2010, 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 56 matching lines @@
 class MediaStreamAudioSourceNode;
 class OscillatorNode;
 class PannerNode;
 class PeriodicWave;
 class ScriptProcessorNode;
 class WaveShaperNode;
 
 // AudioContext is the cornerstone of the web audio API and all AudioNodes are created from it.
 // For thread safety between the audio thread and the main thread, it has a rendering graph locking mechanism.
 
-class AudioContext : public ActiveDOMObject, public ScriptWrappable, public ThreadSafeRefCounted<AudioContext>, public EventTarget {
+class AudioContext : public ActiveDOMObject, public ScriptWrappable, public ThreadSafeRefCounted<AudioContext>, public EventTargetWithInlineData {
 public:
     // Create an AudioContext for rendering to the audio hardware.
     static PassRefPtr<AudioContext> create(Document*);
 
     // Create an AudioContext for offline (non-realtime) rendering.
     static PassRefPtr<AudioContext> createOfflineContext(Document*, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate, ExceptionState&);
 
     virtual ~AudioContext();
 
     bool isInitialized() const;
@@ skipping 138 matching lines @@
     void handleDeferredFinishDerefs();
 
     // Only accessed when the graph lock is held.
     void markSummingJunctionDirty(AudioSummingJunction*);
     void markAudioNodeOutputDirty(AudioNodeOutput*);
 
     // Must be called on main thread.
     void removeMarkedSummingJunction(AudioSummingJunction*);
 
     // EventTarget
-    virtual const AtomicString& interfaceName() const;
-    virtual ScriptExecutionContext* scriptExecutionContext() const;
-    virtual EventTargetData* eventTargetData() { return &m_eventTargetData; }
-    virtual EventTargetData* ensureEventTargetData() { return &m_eventTargetData; }
+    virtual const AtomicString& interfaceName() const OVERRIDE;
+    virtual ScriptExecutionContext* scriptExecutionContext() const OVERRIDE;
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(complete);
 
     // Reconcile ref/deref which are defined both in ThreadSafeRefCounted and EventTarget.
     using ThreadSafeRefCounted<AudioContext>::ref;
     using ThreadSafeRefCounted<AudioContext>::deref;
 
     void startRendering();
     void fireCompletionEvent();
 
@@ skipping 76 matching lines @@
     volatile ThreadIdentifier m_audioThread;
     volatile ThreadIdentifier m_graphOwnerThread; // if the lock is held then this is the thread which owns it, otherwise == UndefinedThreadIdentifier
 
     // Only accessed in the audio thread.
     Vector<AudioNode*> m_deferredFinishDerefList;
 
     // HRTF Database loader
     RefPtr<HRTFDatabaseLoader> m_hrtfDatabaseLoader;
 
     // EventTarget
-    virtual void refEventTarget() { ref(); }
-    virtual void derefEventTarget() { deref(); }
-    EventTargetData m_eventTargetData;
+    virtual void refEventTarget() OVERRIDE { ref(); }
+    virtual void derefEventTarget() OVERRIDE { deref(); }
 
     RefPtr<AudioBuffer> m_renderTarget;
 
     bool m_isOfflineContext;
 
     AsyncAudioDecoder m_audioDecoder;
 
     // This is considering 32 is large enough for multiple channels audio.
     // It is somewhat arbitrary and could be increased if necessary.
     enum { MaxNumberOfChannels = 32 };
 
     // Number of AudioBufferSourceNodes that are active (playing).
     int m_activeSourceCount;
 };
 
 } // WebCore
 
 #endif // AudioContext_h