REBOOT_REASON_UNKNOWN  322 chrome/browser/chromeos/system/automatic_reboot_manager.cc       AutomaticRebootManagerObserver::REBOOT_REASON_UNKNOWN;
REBOOT_REASON_UNKNOWN  379 chrome/browser/chromeos/system/automatic_reboot_manager.cc   DCHECK_NE(AutomaticRebootManagerObserver::REBOOT_REASON_UNKNOWN,