Get rid of unnecessary isChildNodeList() virtual call in clearChildNodeListCache()

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) 2004-2011, 2014 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 575 matching lines @@
 #ifndef NDEBUG
     virtual void formatForDebugger(char* buffer, unsigned length) const;
 
     void showNode(const char* prefix = "") const;
     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();
 
     virtual bool willRespondToMouseMoveEvents();
     virtual bool willRespondToMouseClickEvents();
     virtual bool willRespondToTouchEvents();
 
     enum ShadowTreesTreatment {
         TreatShadowTreesAsDisconnected,
         TreatShadowTreesAsComposed
@@ skipping 292 matching lines @@
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showNode(const blink::Node*);
 void showTree(const blink::Node*);
 void showNodePath(const blink::Node*);
 #endif
 
 #endif