WooCommerce - Remove some shipping methods

<?php
/*
Plugin Name: WooCommerce - Remove Shipping Methods
Plugin URI: http://www.damiencarbery.com
Description: Remove some of the default WooCommerce shipping methods.
Author: Damien Carbery
Version: 0.1
*/

function aw_remove_shipping_methods( $methods ) {
    $methods_to_remove = array('WC_Shipping_International_Delivery', 'WC_Shipping_Local_Delivery', 'WC_Shipping_Local_Pickup');
    $retained_methods = array_diff($methods, $methods_to_remove);
    return $retained_methods;
}

add_filter( 'woocommerce_shipping_methods', 'aw_remove_shipping_methods' );
?>