How to Hide the "InnoDB Converter" Admin Menu

function plt_hide_innodb_table_converter_menus() {
	//Hide the "Tools → InnoDB Converter" menu.
	remove_submenu_page('tools.php', 'innodb-table-converter');
}

add_action('admin_menu', 'plt_hide_innodb_table_converter_menus', 11);

Where do I put this code?