Oilpan: Replace most of RefPtrs for Event objects with oilpan's transition types

Source/core/css/CSSFontFaceLoadEvent.h

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 37 matching lines @@
     static PassRefPtrWillBeRawPtr<CSSFontFaceLoadEvent> create()
     {
         return adoptRefWillBeRefCountedGarbageCollected(new CSSFontFaceLoadEvent());
     }
 
     static PassRefPtrWillBeRawPtr<CSSFontFaceLoadEvent> create(const AtomicString& type, const CSSFontFaceLoadEventInit& initializer)
     {
         return adoptRefWillBeRefCountedGarbageCollected(new CSSFontFaceLoadEvent(type, initializer));
     }
 
-    static PassRefPtr<CSSFontFaceLoadEvent> createForFontFaces(const AtomicString& type, const FontFaceArray& fontfaces = FontFaceArray())
+    static PassRefPtrWillBeRawPtr<CSSFontFaceLoadEvent> createForFontFaces(const AtomicString& type, const FontFaceArray& fontfaces = FontFaceArray())
     {
         return adoptRefWillBeRefCountedGarbageCollected(new CSSFontFaceLoadEvent(type, fontfaces));
     }
 
     virtual ~CSSFontFaceLoadEvent();
 
     FontFaceArray fontfaces() const { return m_fontfaces; }
 
     virtual const AtomicString& interfaceName() const OVERRIDE;
 
     virtual void trace(Visitor*) OVERRIDE;
 
 private:
     CSSFontFaceLoadEvent();
     CSSFontFaceLoadEvent(const AtomicString&, const FontFaceArray&);
     CSSFontFaceLoadEvent(const AtomicString&, const CSSFontFaceLoadEventInit&);
 
     FontFaceArray m_fontfaces;
 };
 
 } // namespace WebCore
 
 #endif // CSSFontFaceLoadEvent_h