Remove oxygen body classes

add_action( 'body_class', 'remove_oxy_body_classes');
function remove_oxy_body_classes( $classes ) {
    if (in_array('theme-oxygen-is-not-a-theme', $classes)) {
        unset( $classes[array_search('theme-oxygen-is-not-a-theme', $classes)] );
    }
    if (in_array('oxygen-body', $classes)) {
        unset( $classes[array_search('oxygen-body', $classes)] );
    }
    return $classes;
}