Make collection caching code more consistent

Source/core/html/HTMLTableRowElement.cpp

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 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
@@ skipping 11 matching lines @@
  * Boston, MA 02110-1301, USA.
  */
 
 #include "config.h"
 #include "core/html/HTMLTableRowElement.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/HTMLNames.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/ExceptionCode.h"
+#include "core/dom/NodeListsNodeData.h"
 #include "core/html/HTMLCollection.h"
 #include "core/html/HTMLTableCellElement.h"
 #include "core/html/HTMLTableElement.h"
 #include "core/html/HTMLTableSectionElement.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 inline HTMLTableRowElement::HTMLTableRowElement(Document& document)
@@ skipping 106 matching lines @@
     if (index >= 0 && index < numCells) {
         RefPtrWillBeRawPtr<Element> cell = children->item(index);
         HTMLElement::removeChild(cell.get(), exceptionState);
     } else {
         exceptionState.throwDOMException(IndexSizeError, "The value provided (" + String::number(index) + ") is outside the range [0, " + String::number(numCells) + ").");
     }
 }
 
 PassRefPtrWillBeRawPtr<HTMLCollection> HTMLTableRowElement::cells()
 {
-    return ensureCachedHTMLCollection(TRCells);
+    return ensureCachedCollection<HTMLCollection>(TRCells);
 }
 
 }