Reduce repetitive EventTarget subclassing

Source/core/html/track/TrackBase.h

Index: Source/core/html/track/TrackBase.h
diff --git a/Source/core/html/track/TrackBase.h b/Source/core/html/track/TrackBase.h
index 41e5a5b24fd55a1e91196efe70184d2cfc9d81d6..1faf0c7b00e1d82d66ca2d5f168b0ce9cd956574 100644
--- a/Source/core/html/track/TrackBase.h
+++ b/Source/core/html/track/TrackBase.h
@@ -33,15 +33,15 @@ namespace WebCore {
 
 class ScriptExecutionContext;
 
-class TrackBase : public RefCounted<TrackBase>, public EventTarget {
+class TrackBase : public RefCounted<TrackBase>, public EventTargetWithInlineData {
 public:
     virtual ~TrackBase();
 
     enum Type { BaseTrack, TextTrack, AudioTrack, VideoTrack };
     Type type() const { return m_type; }
 
-    virtual const AtomicString& interfaceName() const;
-    virtual ScriptExecutionContext* scriptExecutionContext() const;
+    virtual const AtomicString& interfaceName() const OVERRIDE;
+    virtual ScriptExecutionContext* scriptExecutionContext() const OVERRIDE;
 
     using RefCounted<TrackBase>::ref;
     using RefCounted<TrackBase>::deref;
@@ -49,17 +49,13 @@ public:
 protected:
     TrackBase(ScriptExecutionContext*, Type);
 
-    virtual EventTargetData* eventTargetData();
-    virtual EventTargetData* ensureEventTargetData();
-
 private:
     Type m_type;
 
-    virtual void refEventTarget() { ref(); }
-    virtual void derefEventTarget() { deref(); }
+    virtual void refEventTarget() OVERRIDE { ref(); }
+    virtual void derefEventTarget() OVERRIDE { deref(); }
 
     ScriptExecutionContext* m_scriptExecutionContext;
-    EventTargetData m_eventTargetData;
 };
 
 } // namespace WebCore