Oilpan: add [WillBeGarbageCollected] for Element.

Source/core/html/HTMLFormControlsCollection.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Samsung Electronics. 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 174 matching lines @@
                 cache->addElementWithId(idAttrVal, element);
             if (!nameAttrVal.isEmpty() && idAttrVal != nameAttrVal && !foundInputElements.contains(nameAttrVal.impl()))
                 cache->addElementWithName(nameAttrVal, element);
         }
     }
 
     // Set the named item cache last as traversing the tree may cause cache invalidation.
     setNamedItemCache(cache.release());
 }
 
-void HTMLFormControlsCollection::namedGetter(const AtomicString& name, bool& radioNodeListEnabled, RefPtrWillBeRawPtr<RadioNodeList>& radioNodeList, bool& elementEnabled, RefPtr<Element>& element)
+void HTMLFormControlsCollection::namedGetter(const AtomicString& name, bool& radioNodeListEnabled, RefPtrWillBeRawPtr<RadioNodeList>& radioNodeList, bool& elementEnabled, RefPtrWillBeRawPtr<Element>& element)
 {
     WillBeHeapVector<RefPtrWillBeMember<Element> > namedItems;
     this->namedItems(name, namedItems);
 
     if (namedItems.isEmpty())
         return;
 
     if (namedItems.size() == 1) {
         elementEnabled = true;
-        // FIXME: Oilpan: remove the call to |get| when Element becomes [GarbageCollected].
-        element = namedItems.at(0).get();
+        element = namedItems.at(0);
         return;
     }
 
     radioNodeListEnabled = true;
     radioNodeList = ownerNode().radioNodeList(name);
 }
 
 void HTMLFormControlsCollection::supportedPropertyNames(Vector<String>& names)
 {
     // http://www.whatwg.org/specs/web-apps/current-work/multipage/common-dom-interfaces.html#htmlformcontrolscollection-0:
@@ skipping 15 matching lines @@
         const AtomicString& nameAttribute = element->getNameAttribute();
         if (!nameAttribute.isEmpty()) {
             HashSet<AtomicString>::AddResult addResult = existingNames.add(nameAttribute);
             if (addResult.isNewEntry)
                 names.append(nameAttribute);
         }
     }
 }
 
 }