convert //mash to std::unique_ptr

mash/wm/user_window_controller_impl.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_USER_WINDOW_CONTROLLER_IMPL_H_
 #define MASH_WM_USER_WINDOW_CONTROLLER_IMPL_H_
 
 #include <stdint.h>
 
+#include <memory>
+
 #include "base/macros.h"
 #include "components/mus/common/types.h"
 #include "components/mus/public/cpp/window_observer.h"
 #include "components/mus/public/cpp/window_tree_connection_observer.h"
 #include "mash/wm/public/interfaces/user_window_controller.mojom.h"
 
 namespace mash {
 namespace wm {
 
 class RootWindowController;
@@ skipping 22 matching lines @@
   // mus::WindowTreeConnectionObserver:
   void OnWindowTreeFocusChanged(mus::Window* gained_focus,
                                 mus::Window* lost_focus) override;
 
   // mojom::UserWindowController:
   void AddUserWindowObserver(mojom::UserWindowObserverPtr observer) override;
   void FocusUserWindow(uint32_t window_id) override;
 
   RootWindowController* root_controller_;
   mojom::UserWindowObserverPtr user_window_observer_;
-  scoped_ptr<WindowPropertyObserver> window_property_observer_;
+  std::unique_ptr<WindowPropertyObserver> window_property_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(UserWindowControllerImpl);
 };
 
 }  // namespace wm
 }  // namespace mash
 
 #endif  // MASH_WM_USER_WINDOW_CONTROLLER_IMPL_H_