Convert //ash from scoped_ptr to std::unique_ptr

ash/shelf/shelf_widget.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_SHELF_SHELF_WIDGET_H_
 #define ASH_SHELF_SHELF_WIDGET_H_
 
+#include <memory>
+
 #include "ash/ash_export.h"
 #include "ash/shelf/background_animator.h"
 #include "ash/shelf/shelf_layout_manager_observer.h"
 #include "ash/shelf/shelf_types.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_observer.h"
 
 namespace aura {
 class Window;
 }
@@ skipping 75 matching lines @@
   // Disable dimming animations for running tests.
   void DisableDimmingAnimationsForTest();
 
   // ShelfLayoutManagerObserver overrides:
   void WillDeleteShelf() override;
 
  private:
   class DelegateView;
 
   ShelfLayoutManager* shelf_layout_manager_;
-  scoped_ptr<Shelf> shelf_;
+  std::unique_ptr<Shelf> shelf_;
   StatusAreaWidget* status_area_widget_;
 
   // delegate_view_ is attached to window_container_ and is cleaned up
   // during CloseChildWindows of the associated RootWindowController.
   DelegateView* delegate_view_;
   BackgroundAnimator background_animator_;
   bool activating_as_fallback_;
   aura::Window* window_container_;
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_WIDGET_H_