Remove tons of OILPAN.

sky/engine/core/html/imports/HTMLImportChild.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 56 matching lines @@
 #endif
 
     Module* module() const;
 
     // HTMLImport
     virtual Document* document() const override;
     virtual bool isDone() const override;
     virtual HTMLImportLoader* loader() const override;
     virtual void stateWillChange() override;
     virtual void stateDidChange() override;
-    virtual void trace(Visitor*) override;
 
 #if !defined(NDEBUG)
     virtual void showThis() override;
 #endif
 
     void setClient(HTMLImportChildClient*);
 #if !ENABLE(OILPAN)
     void clearClient();
 #endif
 
@@ skipping 18 matching lines @@
 
 inline HTMLImportChild* toHTMLImportChild(HTMLImport* import)
 {
     ASSERT(!import || !import->isRoot());
     return static_cast<HTMLImportChild*>(import);
 }
 
 } // namespace blink
 
 #endif // HTMLImportChild_h