Make NodeList::ownerNode() virtual and rename to virtualOwnerNode()

Source/core/dom/NodeList.cpp

-/*
- * Copyright (C) 2013 Google Inc. All rights reserved.
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- * modification, are permitted provided that the following conditions are
- * met:
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- *     * Redistributions of source code must retain the above copyright
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- * this software without specific prior written permission.
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-
-#include "config.h"
-#include "core/dom/NodeList.h"
-
-#include "core/dom/ChildNodeList.h"
-#include "core/dom/EmptyNodeList.h"
-#include "core/dom/LiveNodeList.h"
-#include "core/dom/Node.h"
-
-namespace WebCore {
-
-Node* NodeList::ownerNode() const
-{
-    if (isLiveNodeList())
-        return static_cast<const LiveNodeList*>(this)->ownerNode();
-    if (isChildNodeList())
-        return static_cast<const ChildNodeList*>(this)->ownerNode();
-    if (isEmptyNodeList())
-        return static_cast<const EmptyNodeList*>(this)->ownerNode();
-    return 0;
-}
-
-
-} // namespace WebCore