Inherit EventTarget interface instead of duplicating its code

Source/core/xml/XMLHttpRequestUpload.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 26 matching lines @@
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 #include "wtf/text/AtomicStringHash.h"
 
 namespace WebCore {
 
 class ScriptExecutionContext;
 class XMLHttpRequest;
 
-class XMLHttpRequestUpload : public ScriptWrappable, public EventTarget {
+class XMLHttpRequestUpload : public EventTarget, public ScriptWrappable {
 public:
     static PassOwnPtr<XMLHttpRequestUpload> create(XMLHttpRequest* xmlHttpRequest)
     {
         return adoptPtr(new XMLHttpRequestUpload(xmlHttpRequest));
     }
 
     void ref() { m_xmlHttpRequest->ref(); }
     void deref() { m_xmlHttpRequest->deref(); }
     XMLHttpRequest* xmlHttpRequest() const { return m_xmlHttpRequest; }
 
@@ skipping 17 matching lines @@
     virtual EventTargetData* eventTargetData();
     virtual EventTargetData* ensureEventTargetData();
 
     XMLHttpRequest* m_xmlHttpRequest;
     EventTargetData m_eventTargetData;
 };
 
 } // namespace WebCore
 
 #endif // XMLHttpRequestUpload_h