Convert //ash from scoped_ptr to std::unique_ptr

ash/wm/boot_splash_screen_chromeos.h

 // Copyright 2013 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_BOOT_SPLASH_SCREEN_CHROMEOS_H_
 #define ASH_WM_BOOT_SPLASH_SCREEN_CHROMEOS_H_
 
+#include <memory>
 #include <string>
 
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 
 namespace aura {
 class WindowTreeHost;
 }
 
 namespace ui {
 class Layer;
 class LayerDelegate;
 }
@@ skipping 10 matching lines @@
   explicit BootSplashScreen(aura::WindowTreeHost* host);
   ~BootSplashScreen();
 
   // Begins animating |layer_|'s opacity to 0 over |duration|.
   void StartHideAnimation(base::TimeDelta duration);
 
  private:
   class CopyHostContentLayerDelegate;
 
   // Copies the host window's content to |layer_|.
-  scoped_ptr<CopyHostContentLayerDelegate> layer_delegate_;
+  std::unique_ptr<CopyHostContentLayerDelegate> layer_delegate_;
 
-  scoped_ptr<ui::Layer> layer_;
+  std::unique_ptr<ui::Layer> layer_;
 
   DISALLOW_COPY_AND_ASSIGN(BootSplashScreen);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_BOOT_SPLASH_SCREEN_CHROMEOS_H_