Remove unused feature ElementSetAttributeNodeNS

Source/core/dom/Element.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2013 Apple Inc. All rights reserved.
  *
  * 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
@@ skipping 192 matching lines @@
     virtual void didMoveToNewDocument(Document&) OVERRIDE;
 
     void removeAttribute(const AtomicString& name);
     void removeAttributeNS(const AtomicString& namespaceURI, const AtomicString& localName);
 
     PassRefPtr<Attr> detachAttribute(size_t index);
 
     PassRefPtr<Attr> getAttributeNode(const AtomicString& name);
     PassRefPtr<Attr> getAttributeNodeNS(const AtomicString& namespaceURI, const AtomicString& localName);
     PassRefPtr<Attr> setAttributeNode(Attr*, ExceptionState&);
-    PassRefPtr<Attr> setAttributeNodeNS(Attr*, ExceptionState&);
     PassRefPtr<Attr> removeAttributeNode(Attr*, ExceptionState&);
 
     PassRefPtr<Attr> attrIfExists(const QualifiedName&);
     PassRefPtr<Attr> ensureAttr(const QualifiedName&);
 
     const Vector<RefPtr<Attr> >& attrNodeList();
 
     CSSStyleDeclaration* style();
 
     const QualifiedName& tagQName() const { return m_tagName; }
@@ skipping 663 matching lines @@
 }
 
 inline bool isShadowHost(const Element* element)
 {
     return element && element->shadow();
 }
 
 } // namespace
 
 #endif