mash: Disable ash_sysui; begin removal.

ash/mus/user_window_controller_impl.h

Index: ash/mus/user_window_controller_impl.h
diff --git a/ash/mus/user_window_controller_impl.h b/ash/mus/user_window_controller_impl.h
deleted file mode 100644
index 4fb327c277c02758e4b3960ee8914b6c9e73c405..0000000000000000000000000000000000000000
--- a/ash/mus/user_window_controller_impl.h
+++ /dev/null
@@ -1,72 +0,0 @@
-// 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_USER_WINDOW_CONTROLLER_IMPL_H_
-#define ASH_MUS_USER_WINDOW_CONTROLLER_IMPL_H_
-
-#include <stdint.h>
-
-#include <memory>
-
-#include "ash/public/interfaces/user_window_controller.mojom.h"
-#include "base/macros.h"
-#include "services/ui/common/types.h"
-#include "services/ui/public/cpp/window_observer.h"
-#include "services/ui/public/cpp/window_tree_client_observer.h"
-
-namespace ash {
-namespace mus {
-
-class RootWindowController;
-class WindowPropertyObserver;
-
-class UserWindowControllerImpl : public mojom::UserWindowController,
-                                 public ui::WindowObserver,
-                                 public ui::WindowTreeClientObserver {
- public:
-  UserWindowControllerImpl();
-  ~UserWindowControllerImpl() override;
-
-  mojom::UserWindowObserver* user_window_observer() const {
-    return user_window_observer_.get();
-  }
-
-  void Initialize(RootWindowController* root_controller);
-
- private:
-  void AssignIdIfNecessary(ui::Window* window);
-
-  // Removes observers from the window and client.
-  void RemoveObservers(ui::Window* user_container);
-
-  // Returns the window with the specified user id.
-  ui::Window* GetUserWindowById(uint32_t id);
-
-  // A helper to get the container for user windows.
-  ui::Window* GetUserWindowContainer() const;
-
-  // ui::WindowObserver:
-  void OnTreeChanging(const TreeChangeParams& params) override;
-  void OnWindowDestroying(ui::Window* window) override;
-
-  // ui::WindowTreeClientObserver:
-  void OnWindowTreeFocusChanged(ui::Window* gained_focus,
-                                ui::Window* lost_focus) override;
-
-  // mojom::UserWindowController:
-  void AddUserWindowObserver(mojom::UserWindowObserverPtr observer) override;
-  void ActivateUserWindow(uint32_t window_id) override;
-
-  RootWindowController* root_controller_;
-  mojom::UserWindowObserverPtr user_window_observer_;
-  std::unique_ptr<WindowPropertyObserver> window_property_observer_;
-  uint32_t next_id_ = 1u;
-
-  DISALLOW_COPY_AND_ASSIGN(UserWindowControllerImpl);
-};
-
-}  // namespace mus
-}  // namespace ash
-
-#endif  // ASH_MUS_USER_WINDOW_CONTROLLER_IMPL_H_