Make collection caching code more consistent

Source/core/html/HTMLTableElement.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, 2008, 2010, 2011 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 18 matching lines @@
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/CSSPropertyNames.h"
 #include "core/CSSValueKeywords.h"
 #include "core/HTMLNames.h"
 #include "core/css/CSSImageValue.h"
 #include "core/css/CSSValuePool.h"
 #include "core/css/StylePropertySet.h"
 #include "core/dom/Attribute.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/ExceptionCode.h"
+#include "core/dom/NodeListsNodeData.h"
 #include "core/frame/UseCounter.h"
 #include "core/html/HTMLTableCaptionElement.h"
 #include "core/html/HTMLTableCellElement.h"
 #include "core/html/HTMLTableRowElement.h"
 #include "core/html/HTMLTableRowsCollection.h"
 #include "core/html/HTMLTableSectionElement.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/rendering/RenderTable.h"
 #include "platform/weborigin/Referrer.h"
 #include "wtf/StdLibExtras.h"
@@ skipping 502 matching lines @@
     return name == backgroundAttr || HTMLElement::hasLegalLinkAttribute(name);
 }
 
 const QualifiedName& HTMLTableElement::subResourceAttributeName() const
 {
     return backgroundAttr;
 }
 
 PassRefPtrWillBeRawPtr<HTMLTableRowsCollection> HTMLTableElement::rows()
 {
-    return toHTMLTableRowsCollection(ensureCachedHTMLCollection(TableRows).get());
+    return ensureCachedCollection<HTMLTableRowsCollection>(TableRows);
 }
 
 PassRefPtrWillBeRawPtr<HTMLCollection> HTMLTableElement::tBodies()
 {
-    return ensureCachedHTMLCollection(TableTBodies);
+    return ensureCachedCollection<HTMLCollection>(TableTBodies);
 }
 
 const AtomicString& HTMLTableElement::rules() const
 {
     return getAttribute(rulesAttr);
 }
 
 const AtomicString& HTMLTableElement::summary() const
 {
     return getAttribute(summaryAttr);
 }
 
 void HTMLTableElement::trace(Visitor* visitor)
 {
     visitor->trace(m_sharedCellStyle);
     HTMLElement::trace(visitor);
 }
 
 }