Remove more oilpan.

sky/engine/core/animation/AnimationNode.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 53 matching lines @@
     friend class AnimationPlayer; // Calls attach/detach, updateInheritedTime.
 public:
     // Note that logic in CSSAnimations depends on the order of these values.
     enum Phase {
         PhaseBefore,
         PhaseActive,
         PhaseAfter,
         PhaseNone,
     };
 
-    class EventDelegate : public DummyBase<EventDelegate> {
+    class EventDelegate {
     public:
         virtual ~EventDelegate() { }
         virtual void onEventCondition(const AnimationNode*) = 0;
         virtual void trace(Visitor*) { }
     };
 
     virtual ~AnimationNode() { }
 
     virtual bool isAnimation() const { return false; }
 
@@ skipping 79 matching lines @@
     } m_calculated;
     mutable bool m_needsUpdate;
     mutable double m_lastUpdateTime;
 
     const CalculatedTiming& ensureCalculated() const;
 };
 
 } // namespace blink
 
 #endif