Convert //ash from scoped_ptr to std::unique_ptr

ash/wm/drag_window_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_WM_DRAG_WINDOW_CONTROLLER_H_
 #define ASH_WM_DRAG_WINDOW_CONTROLLER_H_
 
+#include <memory>
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace aura {
 class Window;
 }
 
 namespace ui {
 class LayerTreeOwner;
 }
@@ skipping 25 matching lines @@
   // currently active drag windows list.
   const aura::Window* GetDragWindowForTest(size_t index) const;
   const ui::LayerTreeOwner* GetDragLayerOwnerForTest(size_t index) const;
 
  private:
   class DragWindowDetails;
 
   // Window the drag window is placed beneath.
   aura::Window* window_;
 
-  std::vector<scoped_ptr<DragWindowDetails>> drag_windows_;
+  std::vector<std::unique_ptr<DragWindowDetails>> drag_windows_;
 
   DISALLOW_COPY_AND_ASSIGN(DragWindowController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_DRAG_WINDOW_CONTROLLER_H_