core sidebars plugin not working

I’ve found information that says:
Widget Support

Widget support is enabled by default and you do not have to add any code. The only recommended change is that you go to your template’s functions.php file and remove any coding containing a function similar to the one below.

if ( function_exists('register_sidebar') )
    register_sidebar();

HOwever: when I go into my functions.php I find the following code below and have NO IDEA what to delete. Can someone please help!

* Register our sidebars and widgetized areas. Also register the default Epherma widget.
 *
 * @since Twenty Eleven 1.0
 */
function twentyeleven_widgets_init() {

	register_widget( 'Twenty_Eleven_Ephemera_Widget' );

	register_sidebar( array(
		'name' => __( 'Main Sidebar', 'twentyeleven' ),
		'id' => 'sidebar-1',
		'before_widget' => '<aside id="%1$s" class="widget %2$s">',
		'after_widget' => "</aside>",
		'before_title' => '<h3 class="widget-title">',
		'after_title' => '</h3>',
	) );

	register_sidebar( array(
		'name' => __( 'Showcase Sidebar', 'twentyeleven' ),
		'id' => 'sidebar-2',
		'description' => __( 'The sidebar for the optional Showcase Template', 'twentyeleven' ),
		'before_widget' => '<aside id="%1$s" class="widget %2$s">',
		'after_widget' => "</aside>",
		'before_title' => '<h3 class="widget-title">',
		'after_title' => '</h3>',
	) );

	register_sidebar( array(
		'name' => __( 'Footer Area One', 'twentyeleven' ),
		'id' => 'sidebar-3',
		'description' => __( 'An optional widget area for your site footer', 'twentyeleven' ),
		'before_widget' => '<aside id="%1$s" class="widget %2$s">',
		'after_widget' => "</aside>",
		'before_title' => '<h3 class="widget-title">',
		'after_title' => '</h3>',
	) );

	register_sidebar( array(
		'name' => __( 'Footer Area Two', 'twentyeleven' ),
		'id' => 'sidebar-4',
		'description' => __( 'An optional widget area for your site footer', 'twentyeleven' ),
		'before_widget' => '<aside id="%1$s" class="widget %2$s">',
		'after_widget' => "</aside>",
		'before_title' => '<h3 class="widget-title">',
		'after_title' => '</h3>',
	) );

	register_sidebar( array(
		'name' => __( 'Footer Area Three', 'twentyeleven' ),
		'id' => 'sidebar-5',
		'description' => __( 'An optional widget area for your site footer', 'twentyeleven' ),
		'before_widget' => '<aside id="%1$s" class="widget %2$s">',
		'after_widget' => "</aside>",
		'before_title' => '<h3 class="widget-title">',
		'after_title' => '</h3>',
	) );
}