Remove more oilpan.

sky/engine/core/dom/custom/CustomElementScheduler.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 31 matching lines @@
 namespace blink {
 
 class CustomElementDescriptor;
 class CustomElementMicrotaskImportStep;
 class CustomElementMicrotaskStep;
 class CustomElementRegistrationContext;
 class Document;
 class Element;
 class HTMLImportChild;
 
-class CustomElementScheduler final : public DummyBase<CustomElementScheduler> {
+class CustomElementScheduler final {
     DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(CustomElementScheduler);
 public:
 
     static void scheduleCallback(PassRefPtr<CustomElementLifecycleCallbacks>, PassRefPtr<Element>, CustomElementLifecycleCallbacks::CallbackType);
     static void scheduleAttributeChangedCallback(PassRefPtr<CustomElementLifecycleCallbacks>, PassRefPtr<Element>, const AtomicString& name, const AtomicString& oldValue, const AtomicString& newValue);
 
     static void resolveOrScheduleResolution(PassRefPtr<CustomElementRegistrationContext>, PassRefPtr<Element>, const CustomElementDescriptor&);
     static CustomElementMicrotaskImportStep* scheduleImport(HTMLImportChild*);
 
     static void microtaskDispatcherDidFinish();
@@ skipping 17 matching lines @@
 
     // The element -> callback queue map is populated by the scheduler
     // and owns the lifetimes of the CustomElementCallbackQueues.
     typedef HashMap<RawPtr<Element>, OwnPtr<CustomElementCallbackQueue> > ElementCallbackQueueMap;
     ElementCallbackQueueMap m_elementCallbackQueueMap;
 };
 
 }
 
 #endif // CustomElementScheduler_h