Inherit EventTarget interface instead of duplicating its code

Source/core/loader/appcache/DOMApplicationCache.h

 /*
  * Copyright (C) 2008, 2009 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 22 matching lines @@
 #include "core/page/DOMWindowProperty.h"
 #include "wtf/Forward.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
 class Frame;
 class KURL;
 
-class DOMApplicationCache : public ScriptWrappable, public RefCounted<DOMApplicationCache>, public EventTarget, public DOMWindowProperty {
+class DOMApplicationCache : public EventTarget, public ScriptWrappable, public RefCounted<DOMApplicationCache>, public DOMWindowProperty {
 public:
     static PassRefPtr<DOMApplicationCache> create(Frame* frame) { return adoptRef(new DOMApplicationCache(frame)); }
     ~DOMApplicationCache() { ASSERT(!m_frame); }
 
     virtual void willDestroyGlobalObjectInFrame() OVERRIDE;
 
     unsigned short status() const;
     void update(ExceptionCode&);
     void swapCache(ExceptionCode&);
     void abort();
@@ skipping 28 matching lines @@
     virtual EventTargetData* ensureEventTargetData();
 
     ApplicationCacheHost* applicationCacheHost() const;
 
     EventTargetData m_eventTargetData;
 };
 
 } // namespace WebCore
 
 #endif // DOMApplicationCache_h