Remove tons of OILPAN.

sky/engine/core/animation/DefaultStyleInterpolation.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 DefaultStyleInterpolation_h
 #define DefaultStyleInterpolation_h
 
 #include "core/animation/StyleInterpolation.h"
 #include "core/css/resolver/StyleBuilder.h"
 
 namespace blink {
 
 class DefaultStyleInterpolation : public StyleInterpolation {
 public:
     static PassRefPtr<DefaultStyleInterpolation> create(CSSValue* start, CSSValue* end, CSSPropertyID id)
     {
         return adoptRef(new DefaultStyleInterpolation(start, end, id));
     }
 
     virtual void apply(StyleResolverState& state) const
     {
         StyleBuilder::applyProperty(m_id, state, toInterpolableBool(m_cachedValue.get())->value() ? m_endCSSValue.get() : m_startCSSValue.get());
     }
 
-    virtual void trace(Visitor* visitor) override
-    {
-        StyleInterpolation::trace(visitor);
-        visitor->trace(m_startCSSValue);
-        visitor->trace(m_endCSSValue);
-    }
-
 private:
     DefaultStyleInterpolation(CSSValue* start, CSSValue* end, CSSPropertyID id)
         : StyleInterpolation(InterpolableBool::create(false), InterpolableBool::create(true), id)
         , m_startCSSValue(start)
         , m_endCSSValue(end)
     {
     }
 
     RefPtr<CSSValue> m_startCSSValue;
     RefPtr<CSSValue> m_endCSSValue;
 };
 
 }
 
 #endif