Delete unused AnimatableValue code

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

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 26 matching lines @@
 
 class AnimatableLengthSize final : public AnimatableValue {
  public:
   ~AnimatableLengthSize() override {}
   static PassRefPtr<AnimatableLengthSize> create(
       PassRefPtr<AnimatableValue> width,
       PassRefPtr<AnimatableValue> height) {
     return adoptRef(
         new AnimatableLengthSize(std::move(width), std::move(height)));
   }
-  const AnimatableValue* width() const { return m_width.get(); }
-  const AnimatableValue* height() const { return m_height.get(); }
-
-  bool usesDefaultInterpolationWith(const AnimatableValue*) const override;
-
- protected:
-  PassRefPtr<AnimatableValue> interpolateTo(const AnimatableValue*,
-                                            double fraction) const override;
 
  private:
   AnimatableLengthSize(PassRefPtr<AnimatableValue> width,
                        PassRefPtr<AnimatableValue> height)
       : m_width(width), m_height(height) {}
   AnimatableType type() const override { return TypeLengthSize; }
   bool equalTo(const AnimatableValue*) const override;
 
   RefPtr<AnimatableValue> m_width;
   RefPtr<AnimatableValue> m_height;
 };
 
 DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableLengthSize, isLengthSize());
 
 }  // namespace blink
 
 #endif  // AnimatableLengthSize_h