aura-mus: Implement Deactivate().

ash/mus/window_manager.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 ASH_MUS_WINDOW_MANAGER_H_
 #define ASH_MUS_WINDOW_MANAGER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 163 matching lines @@
                            ui::mojom::MoveLoopSource source,
                            const gfx::Point& cursor_location,
                            const base::Callback<void(bool)>& on_done) override;
   void OnWmCancelMoveLoop(aura::Window* window) override;
   ui::mojom::EventResult OnAccelerator(uint32_t id,
                                        const ui::Event& event) override;
   void OnWmSetClientArea(
       aura::Window* window,
       const gfx::Insets& insets,
       const std::vector<gfx::Rect>& additional_client_areas) override;
+  void OnWmDeactivateWindow(aura::Window* window) override;
 
   // aura::EnvObserver:
   void OnWindowInitialized(aura::Window* window) override;
 
   service_manager::Connector* connector_;
   display::mojom::DisplayControllerPtr display_controller_;
 
   std::unique_ptr<::wm::FocusController> focus_controller_;
   std::unique_ptr<::wm::WMState> wm_state_;
   std::unique_ptr<aura::PropertyConverter> property_converter_;
@@ skipping 24 matching lines @@
 
   std::unique_ptr<ScreenPositionController> screen_position_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManager);
 };
 
 }  // namespace mus
 }  // namespace ash
 
 #endif  // ASH_MUS_WINDOW_MANAGER_H_