Convert //ash from scoped_ptr to std::unique_ptr

ash/desktop_background/desktop_background_widget_controller.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_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_WIDGET_CONTROLLER_H_
 #define ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_WIDGET_CONTROLLER_H_
 
+#include <memory>
+
 #include "ash/ash_export.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "ui/aura/window.h"
 #include "ui/compositor/layer.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_observer.h"
 
 namespace ash {
 class RootWindowController;
 
 // This class implements a widget-based wallpaper.
 // DesktopBackgroundWidgetController is owned by RootWindowController.
@@ skipping 56 matching lines @@
   // widget will show again. As a result, the blue wallpaper fades in from red
   // wallpaper. This is a bad user experience. See bug http://crbug.com/156542
   // for more details.
   void StopAnimating();
 
   // Gets the wrapped DesktopBackgroundWidgetController pointer. Caller should
   // take ownership of the pointer if |pass_ownership| is true.
   DesktopBackgroundWidgetController* GetController(bool pass_ownership);
 
  private:
-  scoped_ptr<DesktopBackgroundWidgetController> controller_;
+  std::unique_ptr<DesktopBackgroundWidgetController> controller_;
 
   DISALLOW_COPY_AND_ASSIGN(AnimatingDesktopController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_WIDGET_CONTROLLER_H_