Remove more oilpan.

sky/engine/core/html/canvas/WebGLContextObject.cpp

 /*
  * Copyright (C) 2011 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 53 matching lines @@
 
 blink::WebGraphicsContext3D* WebGLContextObject::getAWebGraphicsContext3D() const
 {
 #if ENABLE(OILPAN)
     return m_sharedWebGraphicsContext3D ? m_sharedWebGraphicsContext3D->webContext() : 0;
 #else
     return m_context ? m_context->webContext() : 0;
 #endif
 }
 
-void WebGLContextObject::trace(Visitor* visitor)
-{
-    visitor->trace(m_context);
-    WebGLObject::trace(visitor);
 }
-
-}