mash: Create and show a shelf in mash.

ash/mus/root_window_controller.h

 // Copyright 2016 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_ROOT_WINDOW_CONTROLLER_H_
 #define ASH_MUS_ROOT_WINDOW_CONTROLLER_H_
 
 #include <memory>
 
 #include "ash/mus/disconnected_app_handler.h"
@@ skipping 65 matching lines @@
 
   gfx::Rect CalculateDefaultBounds(ui::Window* window) const;
   gfx::Rect GetMaximizedWindowBounds() const;
 
   // ShelfLayoutManagerDelegate:
   void OnShelfWindowAvailable() override;
 
   // Creates the necessary set of layout managers in the shell windows.
   void CreateLayoutManagers();
 
-  // Creates the status area widget that contains the system tray menu.
-  void CreateStatusArea();
-
   WindowManager* window_manager_;
   ui::Window* root_;
   int window_count_ = 0;
 
   display::Display display_;
 
   std::unique_ptr<RootWindowControllerCommon> root_window_controller_common_;
 
   std::unique_ptr<WmRootWindowControllerMus> wm_root_window_controller_;
   std::unique_ptr<WmShelfMus> wm_shelf_;
 
   // Owned by the corresponding container.
   WorkspaceLayoutManager* workspace_layout_manager_ = nullptr;
   std::map<ui::Window*, std::unique_ptr<LayoutManager>> layout_managers_;
 
   std::unique_ptr<AlwaysOnTopController> always_on_top_controller_;
 
   std::unique_ptr<DisconnectedAppHandler> disconnected_app_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindowController);
 };
 
 }  // namespace mus
 }  // namespace ash
 
 #endif  // ASH_MUS_ROOT_WINDOW_CONTROLLER_H_