user_admin_access_delete_confirm_submit($form_id, $form_values)
user/user.module, line 1696
<?php
function user_admin_access_delete_confirm_submit($form_id, $form_values) {
db_query('DELETE FROM {access} WHERE aid = %d', $form_values['aid']);
drupal_set_message(t('The access rule has been deleted.'));
return 'admin/user/rules';
}
?>