blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/animation/PrimitiveInterpolation.h

 // Copyright 2015 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 PrimitiveInterpolation_h
 #define PrimitiveInterpolation_h
 
 #include "core/animation/TypedInterpolationValue.h"
 #include "platform/animation/AnimationUtilities.h"
 #include "platform/heap/Handle.h"
 #include "wtf/PtrUtil.h"
 #include "wtf/Vector.h"
 #include <cmath>
 #include <memory>
 
 namespace blink {
 
-class StyleResolverState;
 
 // Represents an animation's effect between an adjacent pair of
 // PropertySpecificKeyframes after converting the keyframes to an internal
 // format with respect to the animation environment and underlying values.
 class PrimitiveInterpolation {
   USING_FAST_MALLOC(PrimitiveInterpolation);
   WTF_MAKE_NONCOPYABLE(PrimitiveInterpolation);
 
  public:
   virtual ~PrimitiveInterpolation() {}
@@ skipping 110 matching lines @@
   bool isFlip() const final { return true; }
 
   std::unique_ptr<TypedInterpolationValue> m_start;
   std::unique_ptr<TypedInterpolationValue> m_end;
   mutable double m_lastFraction;
 };
 
 }  // namespace blink
 
 #endif  // PrimitiveInterpolation_h