Remove more oilpan.

sky/engine/core/dom/custom/CustomElementCallbackQueue.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:
  *
  * 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
@@ skipping 26 matching lines @@
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 // FIXME: Rename this because it contains resolution and upgrade as
 // well as callbacks.
-class CustomElementCallbackQueue : public DummyBase<CustomElementCallbackQueue> {
+class CustomElementCallbackQueue {
     WTF_MAKE_NONCOPYABLE(CustomElementCallbackQueue);
 public:
     static PassOwnPtr<CustomElementCallbackQueue> create(PassRefPtr<Element>);
 
     typedef int ElementQueueId;
     ElementQueueId owner() const { return m_owner; }
 
     void setOwner(ElementQueueId newOwner)
     {
         // ElementCallbackQueues only migrate towards the top of the
@@ skipping 15 matching lines @@
     RefPtr<Element> m_element;
     Vector<OwnPtr<CustomElementProcessingStep> > m_queue;
     ElementQueueId m_owner;
     size_t m_index;
     bool m_inCreatedCallback;
 };
 
 }
 
 #endif // CustomElementCallbackQueue_h