Removed refcounting from TextResourceDecoder

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 860 matching lines @@
         m_uploadComplete = true;
         if (m_upload && m_uploadEventsAllowed)
             m_upload->dispatchEventAndLoadEnd(XMLHttpRequestProgressEvent::create(EventTypeNames::abort));
     }
 }
 
 void XMLHttpRequest::clearVariablesForLoading()
 {
     // FIXME: when we add the support for multi-part XHR, we will have to think be careful with this initialization.
     m_receivedLength = 0;
-    m_decoder = 0;
+    m_decoder.clear();
 
     m_responseEncoding = String();
 }
 
 bool XMLHttpRequest::internalAbort(DropProtection async)
 {
     m_error = true;
 
     clearVariablesForLoading();
 
@@ skipping 474 matching lines @@
 {
     return EventTargetNames::XMLHttpRequest;
 }
 
 ExecutionContext* XMLHttpRequest::executionContext() const
 {
     return ActiveDOMObject::executionContext();
 }
 
 } // namespace WebCore