Remove tons of OILPAN.

sky/engine/core/animation/LegacyStyleInterpolation.h

Index: sky/engine/core/animation/LegacyStyleInterpolation.h
diff --git a/sky/engine/core/animation/LegacyStyleInterpolation.h b/sky/engine/core/animation/LegacyStyleInterpolation.h
index cf49f34a9fe9d76665194bb65f9871f34794efd7..162570a50ca1f4d4344ffffcf6eb6bb51744323e 100644
--- a/sky/engine/core/animation/LegacyStyleInterpolation.h
+++ b/sky/engine/core/animation/LegacyStyleInterpolation.h
@@ -28,11 +28,6 @@ public:
         return toInterpolableAnimatableValue(m_cachedValue.get())->value();
     }
 
-    virtual void trace(Visitor* visitor) override
-    {
-        StyleInterpolation::trace(visitor);
-    }
-
 private:
     LegacyStyleInterpolation(PassOwnPtr<InterpolableValue> start, PassOwnPtr<InterpolableValue> end, CSSPropertyID id)
         : StyleInterpolation(start, end, id)