Remove more oilpan.

sky/engine/core/animation/Keyframe.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef Keyframe_h
 #define Keyframe_h
 
 #include "core/CSSPropertyNames.h"
 #include "core/animation/AnimationEffect.h"
 #include "core/animation/AnimationNode.h"
@@ skipping 32 matching lines @@
         RefPtr<Keyframe> theClone = clone();
         theClone->setOffset(offset);
         return theClone.release();
     }
 
     virtual bool isAnimatableValueKeyframe() const { return false; }
     virtual bool isStringKeyframe() const { return false; }
 
     virtual void trace(Visitor*) { }
 
-    class PropertySpecificKeyframe : public DummyBase<PropertySpecificKeyframe> {
+    class PropertySpecificKeyframe {
     public:
         virtual ~PropertySpecificKeyframe() { }
         double offset() const { return m_offset; }
         TimingFunction& easing() const { return *m_easing; }
         AnimationEffect::CompositeOperation composite() const { return m_composite; }
         virtual PassOwnPtr<PropertySpecificKeyframe> cloneWithOffset(double offset) const = 0;
 
         virtual const PassRefPtr<AnimatableValue> getAnimatableValue() const = 0;
 
         virtual bool isAnimatableValuePropertySpecificKeyframe() const { return false; }
@@ skipping 29 matching lines @@
     }
 
     double m_offset;
     AnimationEffect::CompositeOperation m_composite;
     RefPtr<TimingFunction> m_easing;
 };
 
 }
 
 #endif