Reduce repetitive EventTarget subclassing

Source/core/dom/MessagePort.h

 /*
  * Copyright (C) 2008 Apple 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 31 matching lines @@
 
 class Event;
 class ExceptionState;
 class Frame;
 class MessagePort;
 class ScriptExecutionContext;
 
 // The overwhelmingly common case is sending a single port, so handle that efficiently with an inline buffer of size 1.
 typedef Vector<RefPtr<MessagePort>, 1> MessagePortArray;
 
-class MessagePort : public RefCounted<MessagePort>, public ScriptWrappable, public EventTarget {
+class MessagePort : public RefCounted<MessagePort>, public ScriptWrappable, public EventTargetWithInlineData {
 public:
     static PassRefPtr<MessagePort> create(ScriptExecutionContext& scriptExecutionContext) { return adoptRef(new MessagePort(scriptExecutionContext)); }
     virtual ~MessagePort();
 
     void postMessage(PassRefPtr<SerializedScriptValue> message, const MessagePortArray*, ExceptionState&);
 
     void start();
     void close();
 
     void entangle(PassRefPtr<MessagePortChannel>);
@@ skipping 32 matching lines @@
     bool isEntangled() { return !m_closed && !isNeutered(); }
 
     // A port gets neutered when it is transferred to a new owner via postMessage().
     bool isNeutered() { return !m_entangledChannel; }
 
 private:
     explicit MessagePort(ScriptExecutionContext&);
 
     virtual void refEventTarget() OVERRIDE { ref(); }
     virtual void derefEventTarget() OVERRIDE { deref(); }
-    virtual EventTargetData* eventTargetData() OVERRIDE;
-    virtual EventTargetData* ensureEventTargetData() OVERRIDE;
 
     RefPtr<MessagePortChannel> m_entangledChannel;
 
     bool m_started;
     bool m_closed;
 
     ScriptExecutionContext* m_scriptExecutionContext;
-    EventTargetData m_eventTargetData;
 };
 
 } // namespace WebCore
 
 #endif // MessagePort_h