WordpRess: Remove not needed widgets from backend

remove_widgets.php

/*
* Remove unneccesary default widgets from backend
* Comment out what you wish to see
*/
function unregister_default_widgets() {
     unregister_widget('WP_Widget_Pages');
     unregister_widget('WP_Widget_Calendar');
     unregister_widget('WP_Widget_Archives');
     unregister_widget('WP_Widget_Links');
     unregister_widget('WP_Widget_Meta');
     unregister_widget('WP_Widget_Search');
//     unregister_widget('WP_Widget_Text');
     unregister_widget('WP_Widget_Categories');
     unregister_widget('WP_Widget_Recent_Posts');
     unregister_widget('WP_Widget_Recent_Comments');
     unregister_widget('WP_Widget_RSS');
     unregister_widget('WP_Widget_Tag_Cloud');
//     unregister_widget('WP_Nav_Menu_Widget');
     unregister_widget('Twenty_Eleven_Ephemera_Widget');
}
 add_action('widgets_init', 'unregister_default_widgets', 11);