Remove complexity related to m_cachedElementsArrayOffset from LiveNodeListBase

Source/core/html/HTMLNameCollection.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2011, 2012 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.
  *
@@ skipping 31 matching lines @@
 
 HTMLNameCollection::~HTMLNameCollection()
 {
     ASSERT(ownerNode());
     ASSERT(ownerNode()->isDocumentNode());
     ASSERT(type() == WindowNamedItems || type() == DocumentNamedItems);
 
     ownerNode()->nodeLists()->removeCacheWithAtomicName(this, type(), m_name);
 }
 
-Element* HTMLNameCollection::virtualItemAfter(unsigned& offsetInArray, Element* previous) const
+Element* HTMLNameCollection::virtualItemAfter(Element* previous) const
 {
-    ASSERT_UNUSED(offsetInArray, !offsetInArray);
     ASSERT(previous != ownerNode());
 
     Element* current;
     if (!previous)
         current = ElementTraversal::firstWithin(*ownerNode());
     else
         current = ElementTraversal::next(*previous, ownerNode());
 
     for (; current; current = ElementTraversal::next(*current, ownerNode())) {
         switch (type()) {
@@ skipping 31 matching lines @@
             break;
         default:
             ASSERT_NOT_REACHED();
         }
     }
 
     return 0;
 }
 
 }