Oilpan: add [WillBeGarbageCollected] for Element.

Source/core/dom/SelectorQuery.cpp

 /*
  * Copyright (C) 2011, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Samsung Electronics. 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.
@@ skipping 123 matching lines @@
     return false;
 }
 
 PassRefPtrWillBeRawPtr<NodeList> SelectorDataList::queryAll(ContainerNode& rootNode) const
 {
     Vector<RefPtr<Node> > result;
     execute<AllElementsSelectorQueryTrait>(rootNode, result);
     return StaticNodeList::adopt(result);
 }
 
-PassRefPtr<Element> SelectorDataList::queryFirst(ContainerNode& rootNode) const
+PassRefPtrWillBeRawPtr<Element> SelectorDataList::queryFirst(ContainerNode& rootNode) const
 {
     Element* matchedElement = 0;
     execute<SingleElementSelectorQueryTrait>(rootNode, matchedElement);
     return matchedElement;
 }
 
 template <typename SelectorQueryTrait>
 void SelectorDataList::collectElementsByClassName(ContainerNode& rootNode, const AtomicString& className,  typename SelectorQueryTrait::OutputType& output) const
 {
     for (Element* element = ElementTraversal::firstWithin(rootNode); element; element = ElementTraversal::next(*element, &rootNode)) {
@@ skipping 318 matching lines @@
 bool SelectorQuery::matches(Element& element) const
 {
     return m_selectors.matches(element);
 }
 
 PassRefPtrWillBeRawPtr<NodeList> SelectorQuery::queryAll(ContainerNode& rootNode) const
 {
     return m_selectors.queryAll(rootNode);
 }
 
-PassRefPtr<Element> SelectorQuery::queryFirst(ContainerNode& rootNode) const
+PassRefPtrWillBeRawPtr<Element> SelectorQuery::queryFirst(ContainerNode& rootNode) const
 {
     return m_selectors.queryFirst(rootNode);
 }
 
 SelectorQuery* SelectorQueryCache::add(const AtomicString& selectors, const Document& document, ExceptionState& exceptionState)
 {
     HashMap<AtomicString, OwnPtr<SelectorQuery> >::iterator it = m_entries.find(selectors);
     if (it != m_entries.end())
         return it->value.get();
 
@@ skipping 21 matching lines @@
     m_entries.add(selectors, selectorQuery.release());
     return rawSelectorQuery;
 }
 
 void SelectorQueryCache::invalidate()
 {
     m_entries.clear();
 }
 
 }