Reduce repetitive EventTarget subclassing

Source/core/page/EventSource.h

Index: Source/core/page/EventSource.h
diff --git a/Source/core/page/EventSource.h b/Source/core/page/EventSource.h
index 72603254e0c8065b60ae1b05a3d4a156476b6add..5782e676e31d00da6b5377258bdad1de509ad870 100644
--- a/Source/core/page/EventSource.h
+++ b/Source/core/page/EventSource.h
@@ -50,7 +50,7 @@ class ResourceResponse;
 class TextResourceDecoder;
 class ThreadableLoader;
 
-class EventSource : public RefCounted<EventSource>, public ScriptWrappable, public EventTarget, private ThreadableLoaderClient, public ActiveDOMObject {
+class EventSource : public RefCounted<EventSource>, public ScriptWrappable, public EventTargetWithInlineData, private ThreadableLoaderClient, public ActiveDOMObject {
     WTF_MAKE_FAST_ALLOCATED;
 public:
     static PassRefPtr<EventSource> create(ScriptExecutionContext*, const String& url, const Dictionary&, ExceptionState&);
@@ -77,18 +77,16 @@ public:
     using RefCounted<EventSource>::ref;
     using RefCounted<EventSource>::deref;
 
-    virtual const AtomicString& interfaceName() const;
-    virtual ScriptExecutionContext* scriptExecutionContext() const;
+    virtual const AtomicString& interfaceName() const OVERRIDE;
+    virtual ScriptExecutionContext* scriptExecutionContext() const OVERRIDE;
 
     virtual void stop();
 
 private:
     EventSource(ScriptExecutionContext*, const KURL&, const Dictionary&);
 
-    virtual void refEventTarget() { ref(); }
-    virtual void derefEventTarget() { deref(); }
-    virtual EventTargetData* eventTargetData();
-    virtual EventTargetData* ensureEventTargetData();
+    virtual void refEventTarget() OVERRIDE { ref(); }
+    virtual void derefEventTarget() OVERRIDE { deref(); }
 
     virtual void didReceiveResponse(unsigned long, const ResourceResponse&);
     virtual void didReceiveData(const char*, int);
@@ -123,8 +121,6 @@ private:
     String m_lastEventId;
     unsigned long long m_reconnectDelay;
     String m_eventStreamOrigin;
-
-    EventTargetData m_eventTargetData;
 };
 
 } // namespace WebCore