Replace scoped_ptr with std::unique_ptr in //ui

ui/views/mus/window_tree_host_mus.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 UI_VIEWS_MUS_WINDOW_TREE_HOST_MUS_H_
 #define UI_VIEWS_MUS_WINDOW_TREE_HOST_MUS_H_
 
 #include "base/macros.h"
 #include "ui/aura/window_tree_host_platform.h"
 #include "ui/views/mus/mus_export.h"
@@ skipping 26 matching lines @@
 
  private:
   // aura::WindowTreeHostPlatform:
   void DispatchEvent(ui::Event* event) override;
   void OnClosed() override;
   void OnWindowStateChanged(ui::PlatformWindowState new_state) override;
   void OnActivationChanged(bool active) override;
   void OnCloseRequest() override;
 
   NativeWidgetMus* native_widget_;
-  scoped_ptr<InputMethodMUS> input_method_;
+  std::unique_ptr<InputMethodMUS> input_method_;
   ui::PlatformWindowState show_state_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowTreeHostMus);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_MUS_WINDOW_TREE_HOST_MUS_H_