Replace elementHasLegalLinkAttribute() helper with virtual function

Source/core/html/HTMLScriptElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * 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 @@
 
 private:
     HTMLScriptElement(Document&, bool wasInsertedByParser, bool alreadyStarted);
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     virtual void didNotifySubtreeInsertionsToDocument() OVERRIDE;
     virtual void childrenChanged(bool changedByParser = false, Node* beforeChange = 0, Node* afterChange = 0, int childCountDelta = 0) OVERRIDE;
 
     virtual bool isURLAttribute(const Attribute&) const OVERRIDE;
+    virtual bool hasLegalLinkAttribute(const QualifiedName&) const OVERRIDE;
 
     virtual String sourceAttributeValue() const OVERRIDE;
     virtual String charsetAttributeValue() const OVERRIDE;
     virtual String typeAttributeValue() const OVERRIDE;
     virtual String languageAttributeValue() const OVERRIDE;
     virtual String forAttributeValue() const OVERRIDE;
     virtual String eventAttributeValue() const OVERRIDE;
     virtual bool asyncAttributeValue() const OVERRIDE;
     virtual bool deferAttributeValue() const OVERRIDE;
     virtual bool hasSourceAttribute() const OVERRIDE;
 
     virtual void dispatchLoadEvent() OVERRIDE;
 
     virtual PassRefPtr<Element> cloneElementWithoutAttributesAndChildren() OVERRIDE;
 
     OwnPtr<ScriptLoader> m_loader;
 };
 
 } //namespace
 
 #endif