Convert //ash from scoped_ptr to std::unique_ptr

ash/wm/overview/scoped_overview_animation_settings.h

 // Copyright 2014 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_SCOPED_OVERVIEW_ANIMATION_SETTINGS_H_
 #define ASH_WM_OVERVIEW_SCOPED_OVERVIEW_ANIMATION_SETTINGS_H_
 
 #include "ash/wm/overview/overview_animation_type.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 
 namespace aura {
 class Window;
 }  // namespace aura
 
 namespace ash {
 
 // The ScopedOveriewAnimationSettings class correctly configures the animation
 // settings for an aura::Window for a given OverviewAnimationType.
 class ScopedOverviewAnimationSettings {
  public:
   ScopedOverviewAnimationSettings(OverviewAnimationType animation_type,
                                   aura::Window* window);
   virtual ~ScopedOverviewAnimationSettings();
 
  private:
   // The managed animation settings.
   ui::ScopedLayerAnimationSettings animation_settings_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedOverviewAnimationSettings);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_OVERVIEW_SCOPED_OVERVIEW_ANIMATION_SETTINGS_H_