CC Animation: Erase EaseTimingFunction helpers.

cc/animation/timing_function.h

Index: cc/animation/timing_function.h
diff --git a/cc/animation/timing_function.h b/cc/animation/timing_function.h
index 8f021ce735348c7ace44d764a6498a8e21354c8f..85fe92097b5d28585cebc97cd94e887e91a9b000 100644
--- a/cc/animation/timing_function.h
+++ b/cc/animation/timing_function.h
@@ -69,38 +69,6 @@ class CC_EXPORT CubicBezierTimingFunction : public TimingFunction {
   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.