Remove more oilpan.

sky/engine/core/html/imports/HTMLImportsController.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 32 matching lines @@
 namespace blink {
 
 class FetchRequest;
 class ExecutionContext;
 class ResourceFetcher;
 class HTMLImportChild;
 class HTMLImportChildClient;
 class HTMLImportLoader;
 class HTMLImportTreeRoot;
 
-class HTMLImportsController final : public DummyBase<HTMLImportsController>, public DocumentSupplement {
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(HTMLImportsController);
-    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
+class HTMLImportsController final : public DocumentSupplement {
+    WTF_MAKE_FAST_ALLOCATED;
 public:
     static const char* supplementName();
     static void provideTo(Document&);
     static void removeFrom(Document&);
 
     explicit HTMLImportsController(Document&);
     virtual ~HTMLImportsController();
 
     HTMLImportTreeRoot* root() const { return m_root.get(); }
 
@@ skipping 13 matching lines @@
     HTMLImportChild* createChild(const KURL&, HTMLImportLoader*, HTMLImport* parent, HTMLImportChildClient*);
 
     OwnPtr<HTMLImportTreeRoot> m_root;
     typedef Vector<OwnPtr<HTMLImportLoader> > LoaderList;
     LoaderList m_loaders;
 };
 
 } // namespace blink
 
 #endif // HTMLImportsController_h