Remove tons of OILPAN.

sky/engine/core/dom/DOMError.h

 /*
  * Copyright (C) 2012 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:
  * 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 43 matching lines @@
     }
 
     static PassRefPtr<DOMError> create(ExceptionCode ec, const String& message)
     {
         return adoptRef(new DOMError(DOMException::getErrorName(ec), message));
     }
 
     const String& name() const { return m_name; }
     const String& message() const { return m_message; }
 
-    void trace(Visitor*) { }
-
 protected:
     explicit DOMError(const String& name);
     DOMError(const String& name, const String& message);
 
 private:
     const String m_name;
     const String m_message;
 };
 
 } // namespace blink
 
 #endif // DOMError_h