Remove tons of OILPAN.

sky/engine/core/html/imports/HTMLImportLoader.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 75 matching lines @@
     // Tells the loader that the parser is done with this import.
     // Called by Document::finishedParsing, after DOMContentLoaded was dispatched.
     void didFinishParsing();
     // Tells the loader that all of the import's stylesheets finished
     // loading.
     // Called by Document::didRemoveAllPendingStylesheet.
     void didRemoveAllPendingStylesheet();
 
     PassRefPtr<CustomElementSyncMicrotaskQueue> microtaskQueue() const;
 
-    virtual void trace(Visitor*);
-
 private:
     HTMLImportLoader(HTMLImportsController*);
 
     // MojoFetcher::Client
     void OnReceivedResponse(mojo::URLResponsePtr) override;
 
     State startWritingAndParsing(mojo::URLResponsePtr);
     State finishWriting();
     State finishParsing();
     State finishLoading();
@@ skipping 10 matching lines @@
     RefPtr<Module> m_module;
     RefPtr<Document> m_document;
     RefPtr<CustomElementSyncMicrotaskQueue> m_microtaskQueue;
 
     OwnPtr<MojoFetcher> m_fetcher;
 };
 
 } // namespace blink
 
 #endif // HTMLImportLoader_h