mash: Port mojo:ash_sysui's ContextMenuMus to mojo:ash.

ash/mus/context_menu_mus.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_SYSUI_CONTEXT_MENU_MUS_H_
-#define ASH_SYSUI_CONTEXT_MENU_MUS_H_
+#ifndef ASH_MUS_CONTEXT_MENU_MUS_H_
+#define ASH_MUS_CONTEXT_MENU_MUS_H_
 
 #include "ash/common/shelf/shelf_alignment_menu.h"
 #include "base/macros.h"
 #include "ui/base/models/simple_menu_model.h"
 
 namespace ash {
 
 class WmShelf;
 
 // Context menu for mash.
-// TODO(msw): Mimic logic in LauncherContextMenu.
+// TODO(mash): Mimic logic in LauncherContextMenu.

[sky, 2016/08/25 00:00:32]

Unless mash is a real person I would remove the (mash) part. I also recommend
filing a bug.

[msw, 2016/08/25 00:25:14]

Done.

 class ContextMenuMus : public ui::SimpleMenuModel,
                        public ui::SimpleMenuModel::Delegate {
  public:
   explicit ContextMenuMus(WmShelf* wm_shelf);
   ~ContextMenuMus() override;
 
   // ui::SimpleMenuModel::Delegate overrides:
   bool IsCommandIdChecked(int command_id) const override;
   bool IsCommandIdEnabled(int command_id) const override;
   void ExecuteCommand(int command_id, int event_flags) override;
 
  private:
   enum MenuItem {
     MENU_AUTO_HIDE,
     MENU_ALIGNMENT_MENU,
     MENU_CHANGE_WALLPAPER,
   };
 
   WmShelf* wm_shelf_;
   ShelfAlignmentMenu alignment_menu_;
 
   DISALLOW_COPY_AND_ASSIGN(ContextMenuMus);
 };
 
 }  // namespace ash
 
-#endif  // ASH_SYSUI_CONTEXT_MENU_MUS_H_
+#endif  // ASH_MUS_CONTEXT_MENU_MUS_H_