[ash] Cleanup of ScopedOverviewAnimationSettings

ash/wm/overview/scoped_overview_animation_settings_factory_aura.h

-// Copyright 2016 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 ASH_WM_OVERVIEW_WM_SCOPED_OVERVIEW_ANIMATION_SETTINGS_AURA_H_
-#define ASH_WM_OVERVIEW_WM_SCOPED_OVERVIEW_ANIMATION_SETTINGS_AURA_H_
-
-#include <memory>
-
-#include "ash/wm/overview/scoped_overview_animation_settings_factory.h"
-#include "base/macros.h"
-
-namespace ash {
-
-// Aura implementation of ScopedOverviewAnimationSettingsFactory.
-class ScopedOverviewAnimationSettingsFactoryAura
-    : public ScopedOverviewAnimationSettingsFactory {
- public:
-  ScopedOverviewAnimationSettingsFactoryAura();
-  ~ScopedOverviewAnimationSettingsFactoryAura() override;
-
-  // ScopedOverviewAnimationSettingsFactoryAura:
-  std::unique_ptr<ScopedOverviewAnimationSettings>
-  CreateOverviewAnimationSettings(OverviewAnimationType animation_type,
-                                  aura::Window* window) override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ScopedOverviewAnimationSettingsFactoryAura);
-};
-
-}  // namespace ash
-
-#endif  // ASH_WM_OVERVIEW_WM_SCOPED_OVERVIEW_ANIMATION_SETTINGS_AURA_H_