Replace elementHasLegalLinkAttribute() helper with virtual function

Source/core/html/HTMLTableRowElement.cpp

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2010 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
@@ skipping 26 matching lines @@
 namespace WebCore {
 
 using namespace HTMLNames;
 
 HTMLTableRowElement::HTMLTableRowElement(Document& document)
     : HTMLTablePartElement(trTag, document)
 {
     ScriptWrappable::init(this);
 }
 
+bool HTMLTableRowElement::hasLegalLinkAttribute(const QualifiedName& name) const
+{
+    return name == backgroundAttr || HTMLTablePartElement::hasLegalLinkAttribute(name);
+}
+
 PassRefPtr<HTMLTableRowElement> HTMLTableRowElement::create(Document& document)
 {
     return adoptRef(new HTMLTableRowElement(document));
 }
 
 int HTMLTableRowElement::rowIndex() const
 {
     ContainerNode* table = parentNode();
     if (!table)
         return -1;
@@ skipping 88 matching lines @@
         exceptionState.throwDOMException(IndexSizeError, "The value provided (" + String::number(index) + ") is outside the range [0, " + String::number(numCells) + ").");
     }
 }
 
 PassRefPtr<HTMLCollection> HTMLTableRowElement::cells()
 {
     return ensureCachedHTMLCollection(TRCells);
 }
 
 }