Oilpan: move DOM string collection objects to the Oilpan heap.

Source/core/dom/DatasetDOMStringMap.h

 /*
  * Copyright (C) 2010 Apple Inc. 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 18 matching lines @@
 #include "core/dom/DOMStringMap.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace WebCore {
 
 class Element;
 class ExceptionState;
 
 class DatasetDOMStringMap FINAL : public DOMStringMap {
 public:
-    static PassOwnPtr<DatasetDOMStringMap> create(Element* element)
+    static PassOwnPtrWillBeRawPtr<DatasetDOMStringMap> create(Element* element)
     {
-        return adoptPtr(new DatasetDOMStringMap(element));
+        return adoptPtrWillBeNoop(new DatasetDOMStringMap(element));
     }
 
+#if !ENABLE(OILPAN)
     virtual void ref() OVERRIDE;
     virtual void deref() OVERRIDE;
+#endif
 
     virtual void getNames(Vector<String>&) OVERRIDE;
     virtual String item(const String& name) OVERRIDE;
     virtual bool contains(const String& name) OVERRIDE;
     virtual void setItem(const String& name, const String& value, ExceptionState&) OVERRIDE;
     virtual bool deleteItem(const String& name) OVERRIDE;
 
     virtual Element* element() OVERRIDE { return m_element; }
 
+    virtual void trace(Visitor*) OVERRIDE;
+
 private:
     explicit DatasetDOMStringMap(Element* element)
         : m_element(element)
     {
     }
 
-    Element* m_element;
+    RawPtrWillBeMember<Element> m_element;
 };
 
 } // namespace WebCore
 
 #endif // DatasetDOMStringMap_h