Convert //ash from scoped_ptr to std::unique_ptr

ash/system/tray/tray_background_view.h

 // Copyright (c) 2012 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_SYSTEM_TRAY_TRAY_BACKGROUND_VIEW_H_
 #define ASH_SYSTEM_TRAY_TRAY_BACKGROUND_VIEW_H_
 
+#include <memory>
+
 #include "ash/ash_export.h"
 #include "ash/shelf/background_animator.h"
 #include "ash/shelf/shelf_types.h"
 #include "ash/system/tray/actionable_view.h"
 #include "base/macros.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/views/bubble/tray_bubble_view.h"
 
 namespace ash {
 class ShelfLayoutManager;
@@ skipping 163 matching lines @@
   BackgroundAnimator hide_background_animator_;
   BackgroundAnimator hover_background_animator_;
 
   // True if the background gets hovered.
   bool hovered_;
 
   // This variable stores the activation override which will tint the background
   // differently if set to true.
   bool draw_background_as_active_;
 
-  scoped_ptr<TrayWidgetObserver> widget_observer_;
-  scoped_ptr<TrayEventFilter> tray_event_filter_;
+  std::unique_ptr<TrayWidgetObserver> widget_observer_;
+  std::unique_ptr<TrayEventFilter> tray_event_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayBackgroundView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_TRAY_BACKGROUND_VIEW_H_