cros: Disable system tray help/lock buttons during supervised user creation

ash/system/date/system_info_default_view.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_SYSTEM_DATE_SYSTEM_INFO_DEFAULT_VIEW_H_
 #define ASH_SYSTEM_DATE_SYSTEM_INFO_DEFAULT_VIEW_H_
 
 #include "ash/ash_export.h"
-#include "ash/login_status.h"
 #include "base/macros.h"
 #include "ui/views/view.h"
 
 namespace ash {
 class PowerStatusView;
 class SystemTrayItem;
 class TriView;
 
 namespace tray {
 class DateView;
 }  // namespace tray
 
 // The default view for the system info row in the system menu. Contains the
 // current date and, if a battery is present, a string showing the current
 // power status.
 class ASH_EXPORT SystemInfoDefaultView : public views::View {
  public:
-  SystemInfoDefaultView(SystemTrayItem* owner, LoginStatus login);
-
+  explicit SystemInfoDefaultView(SystemTrayItem* owner);
   ~SystemInfoDefaultView() override;
 
   tray::DateView* GetDateView();
   const tray::DateView* GetDateView() const;
 
   // views::View:
   void Layout() override;
 
  private:
   friend class SystemInfoDefaultViewTest;
@@ skipping 10 matching lines @@
   PowerStatusView* power_status_view_ = nullptr;
 
   TriView* tri_view_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemInfoDefaultView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_DATE_SYSTEM_INFO_DEFAULT_VIEW_H_