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

Source/core/dom/ChildNodeList.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Samsung Electronics. 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
@@ skipping 41 matching lines @@
     ContainerNode& rootNode() const { return *m_parent; }
     bool canTraverseBackward() const { return true; }
     Node* itemBefore(const Node* previousItem) const;
     Node* traverseToFirstElement(const ContainerNode& root) const { return root.firstChild(); }
     Node* traverseForwardToOffset(unsigned offset, Node& currentNode, unsigned& currentOffset, const ContainerNode& root) const;
 
 private:
     explicit ChildNodeList(PassRefPtr<ContainerNode> rootNode);
 
     virtual bool isChildNodeList() const OVERRIDE { return true; }
+    virtual Node* virtualOwnerNode() const OVERRIDE;
 
     RefPtr<ContainerNode> m_parent;
     mutable CollectionIndexCache<ChildNodeList, Node> m_collectionIndexCache;
 };
 
 DEFINE_TYPE_CASTS(ChildNodeList, NodeList, nodeList, nodeList->isChildNodeList(), nodeList.isChildNodeList());
 
 } // namespace WebCore
 
 #endif // ChildNodeList_h