tml_do_login_head()

function tml_do_login_head() {
    if ( ! tml_is_action() ) {
        return;
    }

    // This is already attached to "wp_head"
    remove_action( 'login_head', 'wp_print_head_scripts', 9 );

    // Don't index TML actions
    add_filter( 'wp_robots', 'wp_robots_sensitive_page' );
    add_action( 'login_head', 'wp_strict_cross_origin_referrer' );

    /** This action is documented in wp-login.php */
    do_action( 'login_head' );
}

View src/includes/functions.php, line 334 on GitHub