Replace elementHasLegalLinkAttribute() helper with virtual function

Source/core/html/HTMLAnchorElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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 283 matching lines @@
 void HTMLAnchorElement::accessKeyAction(bool sendMouseEvents)
 {
     dispatchSimulatedClick(0, sendMouseEvents ? SendMouseUpDownEvents : SendNoEvents);
 }
 
 bool HTMLAnchorElement::isURLAttribute(const Attribute& attribute) const
 {
     return attribute.name().localName() == hrefAttr || HTMLElement::isURLAttribute(attribute);
 }
 
+bool HTMLAnchorElement::hasLegalLinkAttribute(const QualifiedName& name) const
+{
+    return name == hrefAttr || HTMLElement::hasLegalLinkAttribute(name);
+}
+
 bool HTMLAnchorElement::canStartSelection() const
 {
     // FIXME: We probably want this same behavior in SVGAElement too
     if (!isLink())
         return HTMLElement::canStartSelection();
     return rendererIsEditable();
 }
 
 bool HTMLAnchorElement::draggable() const
 {
@@ skipping 379 matching lines @@
     preconnectToURL(url, motivation);
     m_hasIssuedPreconnect = true;
 }
 
 bool HTMLAnchorElement::isInteractiveContent() const
 {
     return isLink();
 }
 
 }