convert //mash to std::unique_ptr

mash/wm/shadow.h

 // Copyright 2015 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 MASH_WM_SHADOW_H_
 #define MASH_WM_SHADOW_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "components/mus/public/cpp/window_observer.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace ui {
 class Layer;
 }  // namespace ui
 
 namespace mash {
 namespace wm {
@@ skipping 56 matching lines @@
   void UpdateLayerBounds();
 
   // WindowObserver:
   void OnWindowDestroyed(mus::Window* window) override;
 
   // The current style, set when the transition animation starts.
   Style style_;
 
   // The parent layer of the shadow layer. It serves as a container accessible
   // from the outside to control the visibility of the shadow.
-  scoped_ptr<ui::Layer> layer_;
+  std::unique_ptr<ui::Layer> layer_;
 
   // The actual shadow layer corresponding to a cc::NinePatchLayer.
-  scoped_ptr<ui::Layer> shadow_layer_;
+  std::unique_ptr<ui::Layer> shadow_layer_;
 
   // Size of the current shadow image.
   gfx::Size image_size_;
 
   // Bounds of the content that the shadow encloses.
   gfx::Rect content_bounds_;
 
   // The interior inset of the shadow images. The content bounds of the image
   // grid should be set to |content_bounds_| inset by this amount.
   int interior_inset_;
 
   mus::Window* window_;
 
   DISALLOW_COPY_AND_ASSIGN(Shadow);
 };
 
 }  // namespace wm
 }  // namespace mash
 
 #endif  // MASH_WM_SHADOW_H_