Delete unused AnimatableValue code

third_party/WebKit/Source/core/animation/animatable/AnimatableLengthBoxAndBool.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 25 matching lines @@
 namespace blink {
 
 class AnimatableLengthBoxAndBool final : public AnimatableValue {
  public:
   ~AnimatableLengthBoxAndBool() override {}
   static PassRefPtr<AnimatableLengthBoxAndBool> create(
       PassRefPtr<AnimatableValue> box,
       bool flag) {
     return adoptRef(new AnimatableLengthBoxAndBool(std::move(box), flag));
   }
-  const AnimatableValue* box() const { return m_box.get(); }
-  bool flag() const { return m_flag; }
-
- protected:
-  PassRefPtr<AnimatableValue> interpolateTo(const AnimatableValue*,
-                                            double fraction) const override;
-  bool usesDefaultInterpolationWith(const AnimatableValue*) const override;
 
  private:
   AnimatableLengthBoxAndBool(PassRefPtr<AnimatableValue> box, bool flag)
       : m_box(box), m_flag(flag) {}
   AnimatableType type() const override { return TypeLengthBoxAndBool; }
   bool equalTo(const AnimatableValue*) const override;
 
   RefPtr<AnimatableValue> m_box;
   bool m_flag;
 };
 
 DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableLengthBoxAndBool,
                                    isLengthBoxAndBool());
 
 }  // namespace blink
 
 #endif  // AnimatableLengthBoxAndBool_h