Remove tons of OILPAN.

sky/engine/core/animation/LengthStyleInterpolation.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 LengthStyleInterpolation_h
 #define LengthStyleInterpolation_h
 
 #include "core/animation/StyleInterpolation.h"
 #include "platform/Length.h"
 
 namespace blink {
 
 class LengthStyleInterpolation : public StyleInterpolation {
 public:
     static PassRefPtr<LengthStyleInterpolation> create(CSSValue* start, CSSValue* end, CSSPropertyID id,  ValueRange range)
     {
         return adoptRef(new LengthStyleInterpolation(lengthToInterpolableValue(start), lengthToInterpolableValue(end), id, range));
     }
 
     static bool canCreateFrom(const CSSValue&);
 
     virtual void apply(StyleResolverState&) const override;
-
-    virtual void trace(Visitor*) override;
-
 private:
     LengthStyleInterpolation(PassOwnPtr<InterpolableValue> start, PassOwnPtr<InterpolableValue> end, CSSPropertyID id,  ValueRange range)
         : StyleInterpolation(start, end, id)
         , m_range(range)
     { }
 
     static PassOwnPtr<InterpolableValue> lengthToInterpolableValue(CSSValue*);
     static PassRefPtr<CSSValue> interpolableValueToLength(InterpolableValue*, ValueRange);
 
     ValueRange m_range;
 
     friend class AnimationLengthStyleInterpolationTest;
 };
 
 }
 
 #endif