Replace elementHasLegalLinkAttribute() helper with virtual function

Source/core/html/HTMLScriptElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 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
  * version 2 of the License, or (at your option) any later version.
@@ skipping 36 matching lines @@
 PassRefPtr<HTMLScriptElement> HTMLScriptElement::create(Document& document, bool wasInsertedByParser, bool alreadyStarted)
 {
     return adoptRef(new HTMLScriptElement(document, wasInsertedByParser, alreadyStarted));
 }
 
 bool HTMLScriptElement::isURLAttribute(const Attribute& attribute) const
 {
     return attribute.name() == srcAttr || HTMLElement::isURLAttribute(attribute);
 }
 
+bool HTMLScriptElement::hasLegalLinkAttribute(const QualifiedName& name) const
+{
+    return name == srcAttr || HTMLElement::hasLegalLinkAttribute(name);
+}
+
 void HTMLScriptElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
 {
     HTMLElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
     m_loader->childrenChanged();
 }
 
 void HTMLScriptElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     if (name == srcAttr)
         m_loader->handleSourceAttribute(value);
@@ skipping 95 matching lines @@
     ASSERT(!m_loader->haveFiredLoadEvent());
     dispatchEvent(Event::create(EventTypeNames::load));
 }
 
 PassRefPtr<Element> HTMLScriptElement::cloneElementWithoutAttributesAndChildren()
 {
     return adoptRef(new HTMLScriptElement(document(), false, m_loader->alreadyStarted()));
 }
 
 }