Remove tons of OILPAN.

sky/engine/core/animation/Interpolation.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 Interpolation_h
 #define Interpolation_h
 
 #include "core/animation/InterpolableValue.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class Interpolation : public RefCounted<Interpolation> {
     DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(Interpolation);
 public:
     static PassRefPtr<Interpolation> create(PassOwnPtr<InterpolableValue> start, PassOwnPtr<InterpolableValue> end)
     {
         return adoptRef(new Interpolation(start, end));
     }
 
     void interpolate(int iteration, double fraction) const;
 
     virtual bool isStyleInterpolation() const { return false; }
     virtual bool isLegacyStyleInterpolation() const { return false; }
 
-    virtual void trace(Visitor*);
-
 protected:
     const OwnPtr<InterpolableValue> m_start;
     const OwnPtr<InterpolableValue> m_end;
 
     mutable double m_cachedFraction;
     mutable int m_cachedIteration;
     mutable OwnPtr<InterpolableValue> m_cachedValue;
 
     Interpolation(PassOwnPtr<InterpolableValue> start, PassOwnPtr<InterpolableValue> end);
 
 private:
     InterpolableValue* getCachedValueForTesting() const { return m_cachedValue.get(); }
 
     friend class AnimationInterpolableValueTest;
     friend class AnimationInterpolationEffectTest;
 };
 
 }
 
 #endif