Convert //ash from scoped_ptr to std::unique_ptr

ash/wm/resize_shadow.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_RESIZE_SHADOW_H_
 #define ASH_WM_RESIZE_SHADOW_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 
 namespace aura {
 class Window;
 }
 namespace gfx {
 class Rect;
 }
 namespace ui {
 class Layer;
 }
@@ skipping 23 matching lines @@
 
   // Updates the effect positions based on the |bounds| of the window.
   void Layout(const gfx::Rect& bounds);
 
   int GetLastHitTestForTest() const {
     return last_hit_test_;
   }
 
  private:
   // Images for the shadow effect.
-  scoped_ptr< ::wm::ImageGrid> image_grid_;
+  std::unique_ptr<::wm::ImageGrid> image_grid_;
 
   // Hit test value from last call to ShowForHitTest().  Used to prevent
   // repeatedly triggering the same animations for the same hit.
   int last_hit_test_;
 
   DISALLOW_COPY_AND_ASSIGN(ResizeShadow);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_RESIZE_SHADOW_H_