cc: Cleanup class/struct forward declarations

cc/animation/animation_curve.h

 // Copyright 2012 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 CC_ANIMATION_ANIMATION_CURVE_H_
 #define CC_ANIMATION_ANIMATION_CURVE_H_
 
 #include <memory>
 
 #include "base/time/time.h"
 #include "cc/base/cc_export.h"
 #include "cc/output/filter_operations.h"
 #include "ui/gfx/transform.h"
 
 namespace gfx {
 class BoxF;
 }
 
 namespace cc {
 
 class ColorAnimationCurve;
 class FilterAnimationCurve;
 class FloatAnimationCurve;
 class ScrollOffsetAnimationCurve;
 class TransformAnimationCurve;
-class TransformOperations;
 
 // An animation curve is a function that returns a value given a time.
 class CC_EXPORT AnimationCurve {
  public:
   enum CurveType { COLOR, FLOAT, TRANSFORM, FILTER, SCROLL_OFFSET };
 
   virtual ~AnimationCurve() {}
 
   virtual base::TimeDelta Duration() const = 0;
   virtual CurveType Type() const = 0;
@@ skipping 69 matching lines @@
   virtual FilterOperations GetValue(base::TimeDelta t) const = 0;
   virtual bool HasFilterThatMovesPixels() const = 0;
 
   // Partial Animation implementation.
   CurveType Type() const override;
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_ANIMATION_CURVE_H_