Revert the merge. Mac build is mysteriously broken.

third_party/WebKit/WebCore/svg/SVGElementInstance.h

 /*
     Copyright (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
 
     This file is part of the KDE project
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
 
@@ skipping 37 matching lines @@
     {
     public:
         SVGElementInstance(SVGUseElement*, SVGElement* originalElement);
         virtual ~SVGElementInstance();
 
         bool needsUpdate() const { return m_needsUpdate; }
         void setNeedsUpdate(bool);
 
         virtual ScriptExecutionContext* scriptExecutionContext() const;
 
-        virtual Node* toNode() { return shadowTreeElement(); }
+        virtual EventTargetNode* toNode() { return shadowTreeElement(); }
         virtual SVGElementInstance* toSVGElementInstance() { return this; }
 
         virtual void addEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, bool useCapture);
         virtual void removeEventListener(const AtomicString& eventType, EventListener*, bool useCapture);
         virtual bool dispatchEvent(PassRefPtr<Event>, ExceptionCode&);
 
         SVGElement* correspondingElement() const { return m_element.get(); }
         SVGUseElement* correspondingUseElement() const { return m_useElement; }
         SVGElement* shadowTreeElement() const { return m_shadowTreeElement.get(); }
 
@@ skipping 133 matching lines @@
         SVGElementInstance* m_nextSibling;
 
         SVGElementInstance* m_firstChild;
         SVGElementInstance* m_lastChild;
     };
 
 } // namespace WebCore
 
 #endif // ENABLE(SVG)
 #endif