InlinedVisitor: Migrate animation to use inlined tracing

Source/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 RefCountedWillBeGarbageCollectedFinalized<Interpolation> {
 public:
     static PassRefPtrWillBeRawPtr<Interpolation> create(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end)
     {
         return adoptRefWillBeNoop(new Interpolation(start, end));
     }
 
     virtual ~Interpolation();
 
     void interpolate(int iteration, double fraction) const;
 
     virtual bool isStyleInterpolation() const { return false; }
     virtual bool isLegacyStyleInterpolation() const { return false; }
 
-    virtual void trace(Visitor*);
+    DECLARE_VIRTUAL_TRACE();
 
 protected:
     const OwnPtrWillBeMember<InterpolableValue> m_start;
     const OwnPtrWillBeMember<InterpolableValue> m_end;
 
     mutable double m_cachedFraction;
     mutable int m_cachedIteration;
     mutable OwnPtrWillBeMember<InterpolableValue> m_cachedValue;
 
     Interpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end);
 
 private:
     InterpolableValue* getCachedValueForTesting() const { return m_cachedValue.get(); }
 
     friend class AnimationInterpolableValueTest;
     friend class AnimationInterpolationEffectTest;
     friend class AnimationDoubleStyleInterpolationTest;
     friend class AnimationVisibilityStyleInterpolationTest;
     friend class AnimationColorStyleInterpolationTest;
 };
 
 } // namespace blink
 
 #endif // Interpolation_h