Remove more 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 27 matching lines @@
 #include "wtf/PassOwnPtr.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class CustomElementSyncMicrotaskQueue;
 class Document;
 class HTMLImportChild;
 class HTMLImportsController;
 
-class HTMLImportLoader final : public DummyBase<HTMLImportLoader>,
-                               public MojoFetcher::Client {
+class HTMLImportLoader final : public MojoFetcher::Client {
 public:
     enum State {
         StateLoading,
         StateWritten,
         StateParsed,
         StateLoaded,
         StateError
     };
 
     static PassOwnPtr<HTMLImportLoader> create(HTMLImportsController* controller)
@@ skipping 55 matching lines @@
     State m_state;
     RefPtr<Document> m_document;
     RefPtr<CustomElementSyncMicrotaskQueue> m_microtaskQueue;
 
     OwnPtr<MojoFetcher> m_fetcher;
 };
 
 } // namespace blink
 
 #endif // HTMLImportLoader_h