CC Animation: Erase EaseTimingFunction helpers.

cc/animation/timing_function.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_TIMING_FUNCTION_H_
 #define CC_ANIMATION_TIMING_FUNCTION_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 51 matching lines @@
                             double x2,
                             double y2);
 
   gfx::CubicBezier bezier_;
   EaseType ease_type_;
 
  private:
   DISALLOW_ASSIGN(CubicBezierTimingFunction);
 };
 
-class CC_EXPORT EaseTimingFunction {
- public:
-  static std::unique_ptr<TimingFunction> Create();
-
- private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(EaseTimingFunction);
-};
-
-class CC_EXPORT EaseInTimingFunction {
- public:
-  static std::unique_ptr<TimingFunction> Create();
-
- private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(EaseInTimingFunction);
-};
-
-class CC_EXPORT EaseOutTimingFunction {
- public:
-  static std::unique_ptr<TimingFunction> Create();
-
- private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(EaseOutTimingFunction);
-};
-
-class CC_EXPORT EaseInOutTimingFunction {
- public:
-  static std::unique_ptr<TimingFunction> Create();
-
- private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(EaseInOutTimingFunction);
-};
-
 class CC_EXPORT StepsTimingFunction : public TimingFunction {
  public:
   // Web Animations specification, 3.12.4. Timing in discrete steps.
   enum class StepPosition { START, MIDDLE, END };
 
   static std::unique_ptr<StepsTimingFunction> Create(
       int steps,
       StepPosition step_position);
   ~StepsTimingFunction() override;
 
@@ skipping 10 matching lines @@
  private:
   int steps_;
   float steps_start_offset_;
 
   DISALLOW_ASSIGN(StepsTimingFunction);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_TIMING_FUNCTION_H_