display_pending_timeout_id.
(schedule_timeout_display_of_pending_files): Removed.
(unschedule_timeout_display_of_pending_files): Removed.
(display_pending_timeout_callback): Removed.
(unschedule_display_of_pending_files): Don't call
unschedule_timeout_display_of_pending_files() since it's gone.
(queue_pending_files): Schedule an idle display only if we are not
loading, or if all the files have been seen.
(finish_loading): Don't schedule a timeout display.