Remove unused AnimatableValue types

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

-/*
- * Copyright (C) 2013 Google Inc. All rights reserved.
- *
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- * modification, are permitted provided that the following conditions are
- * met:
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- *     * Redistributions of source code must retain the above copyright
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- */
-
-#ifndef AnimatableLengthSize_h
-#define AnimatableLengthSize_h
-
-#include "core/animation/animatable/AnimatableValue.h"
-
-namespace blink {
-
-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)));
-  }
-
- private:
-  AnimatableLengthSize(PassRefPtr<AnimatableValue> width,
-                       PassRefPtr<AnimatableValue> height)
-      : width_(std::move(width)), height_(std::move(height)) {}
-  AnimatableType GetType() const override { return kTypeLengthSize; }
-  bool EqualTo(const AnimatableValue*) const override;
-
-  RefPtr<AnimatableValue> width_;
-  RefPtr<AnimatableValue> height_;
-};
-
-DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableLengthSize, IsLengthSize());
-
-}  // namespace blink
-
-#endif  // AnimatableLengthSize_h