Introduce XMLHttpRequestEventTarget IDL interface

Source/core/xml/XMLHttpRequest.cpp

 /*
  *  Copyright (C) 2004, 2006, 2008 Apple Inc. All rights reserved.
  *  Copyright (C) 2005-2007 Alexey Proskuryakov <ap@webkit.org>
  *  Copyright (C) 2007, 2008 Julien Chaffraix <jchaffraix@webkit.org>
  *  Copyright (C) 2008, 2011 Google Inc. All rights reserved.
  *  Copyright (C) 2012 Intel Corporation
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
@@ skipping 1223 matching lines @@
 const AtomicString& XMLHttpRequest::interfaceName() const
 {
     return eventNames().interfaceForXMLHttpRequest;
 }
 
 ScriptExecutionContext* XMLHttpRequest::scriptExecutionContext() const
 {
     return ActiveDOMObject::scriptExecutionContext();
 }
 
-EventTargetData* XMLHttpRequest::eventTargetData()
-{
-    return &m_eventTargetData;
-}
-
-EventTargetData* XMLHttpRequest::ensureEventTargetData()
-{
-    return &m_eventTargetData;
-}
-
 } // namespace WebCore