Make DOMParser::parseFromString specification compliant and throw exception in error scenario.

Source/core/xml/DOMParser.h

 /*
  *  Copyright (C) 2003, 2006 Apple Computer, Inc.
  *
  *  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
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  *  Lesser General Public License for more details.
  *
  *  You should have received a copy of the GNU Lesser General Public
  *  License along with this library; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
 #ifndef DOMParser_h
 #define DOMParser_h
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "wtf/Forward.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 class Document;
+class ExceptionState;
 
 class DOMParser : public RefCounted<DOMParser>, public ScriptWrappable {
 public:
     static PassRefPtr<DOMParser> create() { return adoptRef(new DOMParser); }
 
-    PassRefPtr<Document> parseFromString(const String&, const String& contentType);
+    PassRefPtr<Document> parseFromString(const String&, const String& contentType, ExceptionState&);
 
 private:
     DOMParser()
     {
         ScriptWrappable::init(this);
     }
 };
 
 }
 
 #endif // XMLSerializer.h