Remove unused AnimatableValue types

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

-// Copyright 2017 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef AnimatableFontVariationSettings_h
-#define AnimatableFontVariationSettings_h
-
-#include "core/animation/animatable/AnimatableValue.h"
-
-#include "platform/fonts/opentype/FontSettings.h"
-
-namespace blink {
-
-class AnimatableFontVariationSettings final : public AnimatableValue {
- public:
-  ~AnimatableFontVariationSettings() override {}
-  static PassRefPtr<AnimatableFontVariationSettings> Create(
-      PassRefPtr<FontVariationSettings> settings) {
-    return AdoptRef(new AnimatableFontVariationSettings(std::move(settings)));
-  }
-
- private:
-  explicit AnimatableFontVariationSettings(
-      PassRefPtr<FontVariationSettings> settings)
-      : settings_(std::move(settings)) {}
-  AnimatableType GetType() const override { return kTypeFontVariationSettings; }
-  bool EqualTo(const AnimatableValue* other) const final;
-
-  const RefPtr<FontVariationSettings> settings_;
-};
-
-DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableFontVariationSettings,
-                                   IsFontVariationSettings());
-
-}  // namespace blink
-
-#endif  // AnimatableFontVariationSettings_h