Oilpan: move LiveNodeList collections to the heap.

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2890 matching lines @@
     if (!document().isHTMLDocument())
         return;
 
     if (!oldId.isEmpty())
         toHTMLDocument(document()).removeExtraNamedItem(oldId);
 
     if (!newId.isEmpty())
         toHTMLDocument(document()).addExtraNamedItem(newId);
 }
 
-PassRefPtr<HTMLCollection> Element::ensureCachedHTMLCollection(CollectionType type)
+PassRefPtrWillBeRawPtr<HTMLCollection> Element::ensureCachedHTMLCollection(CollectionType type)
 {
     if (HTMLCollection* collection = cachedHTMLCollection(type))
         return collection;
 
     if (type == TableRows) {
         ASSERT(isHTMLTableElement(this));
         return ensureRareData().ensureNodeLists().addCache<HTMLTableRowsCollection>(*this, type);
     } else if (type == SelectOptions) {
         ASSERT(isHTMLSelectElement(this));
         return ensureRareData().ensureNodeLists().addCache<HTMLOptionsCollection>(*this, type);
@@ skipping 379 matching lines @@
 
 void Element::trace(Visitor* visitor)
 {
     if (hasRareData())
         visitor->trace(elementRareData());
 
     ContainerNode::trace(visitor);
 }
 
 } // namespace WebCore