[oilpan]: Move DOMWindowCSS to the oilpan heap using transition types.

Source/core/css/DOMWindowCSS.h

 /*
  * Copyright (C) 2012 Motorola Mobility 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
@@ skipping 12 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DOMWindowCSS_h
 #define DOMWindowCSS_h
 
+#include "heap/Handle.h"
 #include "wtf/Forward.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
-class DOMWindowCSS : public RefCounted<DOMWindowCSS> {
+class DOMWindowCSS : public RefCountedWillBeGarbageCollected<DOMWindowCSS> {
 public:
-    static PassRefPtr<DOMWindowCSS> create();
+    static PassRefPtrWillBeRawPtr<DOMWindowCSS> create();
 
     bool supports(const String& property, const String& value) const;
     bool supports(const String& conditionText) const;
 
+    void trace(Visitor*) { }
+
 private:
     DOMWindowCSS()
     {
     }
 };
 
 }
 
 #endif