Convert //ash from scoped_ptr to std::unique_ptr

ash/shell/shell_delegate_impl.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_SHELL_SHELL_DELEGATE_IMPL_H_
 #define ASH_SHELL_SHELL_DELEGATE_IMPL_H_
 
+#include <memory>
 #include <string>
 
 #include "ash/shell_delegate.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 
 namespace keyboard {
 class KeyboardUI;
 }
 
@@ skipping 32 matching lines @@
   ash::NewWindowDelegate* CreateNewWindowDelegate() override;
   ash::MediaDelegate* CreateMediaDelegate() override;
   ui::MenuModel* CreateContextMenu(ash::Shelf* shelf,
                                    const ash::ShelfItem* item) override;
   GPUSupport* CreateGPUSupport() override;
   base::string16 GetProductName() const override;
   gfx::Image GetDeprecatedAcceleratorImage() const override;
 
  private:
   ShelfDelegateImpl* shelf_delegate_;
-  scoped_ptr<app_list::AppListViewDelegate> app_list_view_delegate_;
+  std::unique_ptr<app_list::AppListViewDelegate> app_list_view_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellDelegateImpl);
 };
 
 }  // namespace shell
 }  // namespace ash
 
 #endif  // ASH_SHELL_SHELL_DELEGATE_IMPL_H_