Move LiveNodeListBase class to its own header

Source/core/dom/LiveNodeList.cpp

 /*
  * 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, 2006, 2007, 2008, 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "config.h"
 #include "core/dom/LiveNodeList.h"
 
-#include "core/dom/Element.h"
-#include "core/html/HTMLCollection.h"
-
 namespace WebCore {
 
-ContainerNode& LiveNodeListBase::rootNode() const
-{
-    if (isRootedAtDocument() && m_ownerNode->inDocument())
-        return m_ownerNode->document();
-    return *m_ownerNode;
-}
-
-void LiveNodeListBase::didMoveToDocument(Document& oldDocument, Document& newDocument)
-{
-    invalidateCache(&oldDocument);
-    oldDocument.unregisterNodeList(this);
-    newDocument.registerNodeList(this);
-}
-
-void LiveNodeListBase::invalidateIdNameCacheMaps() const
-{
-    ASSERT(hasIdNameCache());
-    static_cast<const HTMLCollection*>(this)->invalidateIdNameCacheMaps();
-}
-
 Node* LiveNodeList::virtualOwnerNode() const
 {
     return ownerNode();
 }
 
 void LiveNodeList::invalidateCache(Document*) const
 {
     m_collectionIndexCache.invalidate();
 }
 
 } // namespace WebCore