Remove unused AnimatableValue types

third_party/WebKit/Source/core/animation/animatable/AnimatableUnknown.h

Index: third_party/WebKit/Source/core/animation/animatable/AnimatableUnknown.h
diff --git a/third_party/WebKit/Source/core/animation/animatable/AnimatableUnknown.h b/third_party/WebKit/Source/core/animation/animatable/AnimatableUnknown.h
index 75e461f263b1742829d4207dcc00211087a790e2..5b3969b196682cfe1ce9a6c63e67158c60d27cfc 100644
--- a/third_party/WebKit/Source/core/animation/animatable/AnimatableUnknown.h
+++ b/third_party/WebKit/Source/core/animation/animatable/AnimatableUnknown.h
@@ -59,28 +59,15 @@ class AnimatableUnknown final : public AnimatableValue {
     return DefaultInterpolateTo(this, value, fraction);
   }
 
-  bool UsesDefaultInterpolationWith(const AnimatableValue*) const override;
-
  private:
   explicit AnimatableUnknown(const CSSValue* value) : value_(value) {}
   AnimatableType GetType() const override { return kTypeUnknown; }
-  bool EqualTo(const AnimatableValue*) const override;
 
   const Persistent<const CSSValue> value_;
 };
 
 DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableUnknown, IsUnknown());
 
-inline bool AnimatableUnknown::EqualTo(const AnimatableValue* value) const {
-  const AnimatableUnknown* unknown = ToAnimatableUnknown(value);
-  return DataEquivalent(value_, unknown->value_);
-}
-
-inline bool AnimatableUnknown::UsesDefaultInterpolationWith(
-    const AnimatableValue* value) const {
-  return !EqualTo(value);
-}
-
 }  // namespace blink
 
 #endif  // AnimatableUnknown_h