Remove unused feature ElementSetAttributeNodeNS

Source/core/dom/Element.cpp

 /*
  * 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)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2005 matching lines @@
 
     setAttributeInternal(index, attrNode->qualifiedName(), attrNode->value(), NotInSynchronizationOfLazyAttribute);
 
     attrNode->attachToElement(this);
     treeScope().adoptIfNeeded(*attrNode);
     ensureAttrNodeListForElement(this).append(attrNode);
 
     return oldAttrNode.release();
 }
 
-PassRefPtr<Attr> Element::setAttributeNodeNS(Attr* attr, ExceptionState& exceptionState)
-{
-    return setAttributeNode(attr, exceptionState);
-}
-
 PassRefPtr<Attr> Element::removeAttributeNode(Attr* attr, ExceptionState& exceptionState)
 {
     if (!attr) {
         exceptionState.throwDOMException(TypeMismatchError, "The node provided is invalid.");
         return 0;
     }
     if (attr->ownerElement() != this) {
         exceptionState.throwDOMException(NotFoundError, "The node provided is owned by another element.");
         return 0;
     }
@@ skipping 1574 matching lines @@
     // Before doing so, we need to resolve issues in HTMLSelectElement::recalcListItems
     // and RenderMenuList::setText. See also https://bugs.webkit.org/show_bug.cgi?id=88405
     if (hasTagName(optionTag) || hasTagName(optgroupTag))
         return false;
     if (FullscreenElementStack::isActiveFullScreenElement(this))
         return false;
     return true;
 }
 
 } // namespace WebCore