Remove complexity related to m_cachedElementsArrayOffset from LiveNodeListBase

Source/core/html/HTMLTableRowsCollection.cpp

 /*
  * Copyright (C) 2008, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 144 matching lines @@
     : HTMLCollection(table, TableRows, OverridesItemAfter)
 {
     ASSERT(table->hasTagName(tableTag));
 }
 
 PassRefPtr<HTMLTableRowsCollection> HTMLTableRowsCollection::create(Node* table, CollectionType)
 {
     return adoptRef(new HTMLTableRowsCollection(table));
 }
 
-Element* HTMLTableRowsCollection::virtualItemAfter(unsigned& offsetInArray, Element* previous) const
+Element* HTMLTableRowsCollection::virtualItemAfter(Element* previous) const
 {
-    ASSERT_UNUSED(offsetInArray, !offsetInArray);
     return rowAfter(toHTMLTableElement(ownerNode()), toHTMLTableRowElement(previous));
 }
 
 }