Make sure the rootNode of a LiveNodeListBase is always a ContainerNode

Source/core/dom/Node.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, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * 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 574 matching lines @@
     void showTreeForThis() const;
     void showNodePathForThis() const;
     void showTreeAndMark(const Node* markedNode1, const char* markedLabel1, const Node* markedNode2 = 0, const char* markedLabel2 = 0) const;
     void showTreeForThisAcrossFrame() const;
 #endif
 
     void invalidateNodeListCachesInAncestors(const QualifiedName* attrName = 0, Element* attributeOwnerElement = 0);
     NodeListsNodeData* nodeLists();
     void clearNodeLists();
 
-    PassRefPtr<NodeList> getElementsByTagName(const AtomicString&);
-    PassRefPtr<NodeList> getElementsByTagNameNS(const AtomicString& namespaceURI, const AtomicString& localName);
-    PassRefPtr<NodeList> getElementsByName(const AtomicString& elementName);
-    PassRefPtr<NodeList> getElementsByClassName(const AtomicString& classNames);
-    PassRefPtr<RadioNodeList> radioNodeList(const AtomicString&, bool onlyMatchImgElements = false);
-
     virtual bool willRespondToMouseMoveEvents();
     virtual bool willRespondToMouseClickEvents();
     virtual bool willRespondToTouchEvents();
 
     PassRefPtr<Element> querySelector(const AtomicString& selectors, ExceptionState&);
     PassRefPtr<NodeList> querySelectorAll(const AtomicString& selectors, ExceptionState&);
 
     unsigned short compareDocumentPosition(const Node*) const;
 
     enum ShadowTreesTreatment {
@@ skipping 297 matching lines @@
 
 } // namespace WebCore
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const WebCore::Node*);
 void showNodePath(const WebCore::Node*);
 #endif
 
 #endif