Remove tons of OILPAN.

sky/engine/core/css/FontFaceSetLoadEvent.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 49 matching lines @@
     {
         return adoptRef(new FontFaceSetLoadEvent(type, fontfaces));
     }
 
     virtual ~FontFaceSetLoadEvent();
 
     FontFaceArray fontfaces() const { return m_fontfaces; }
 
     virtual const AtomicString& interfaceName() const override;
 
-    virtual void trace(Visitor*) override;
-
 private:
     FontFaceSetLoadEvent();
     FontFaceSetLoadEvent(const AtomicString&, const FontFaceArray&);
     FontFaceSetLoadEvent(const AtomicString&, const FontFaceSetLoadEventInit&);
 
     FontFaceArray m_fontfaces;
 };
 
 } // namespace blink
 
 #endif // FontFaceSetLoadEvent_h