RemoveLastWindowClosedObserver   25 ash/system/chromeos/session/last_window_closed_logout_reminder.cc   Shell::GetInstance()->system_tray_notifier()->RemoveLastWindowClosedObserver(
RemoveLastWindowClosedObserver  102 ash/system/tray/system_tray_notifier.h   void RemoveLastWindowClosedObserver(LastWindowClosedObserver* observer);