Index: wp-includes/default-widgets.php
===================================================================
--- wp-includes/default-widgets.php	(revision 26862)
+++ wp-includes/default-widgets.php	(working copy)
@@ -392,7 +392,7 @@
 
 	function __construct() {
 		$widget_ops = array('classname' => 'widget_text', 'description' => __('Arbitrary text or HTML.'));
-		$control_ops = array('width' => 400, 'height' => 350);
+		$control_ops = array( 'height' => 350 );
 		parent::__construct('text', __('Text'), $widget_ops, $control_ops);
 	}
 
@@ -743,7 +743,7 @@
 
 	function __construct() {
 		$widget_ops = array( 'description' => __('Entries from any RSS or Atom feed.') );
-		$control_ops = array( 'width' => 400, 'height' => 200 );
+		$control_ops = array( 'height' => 200 );
 		parent::__construct( 'rss', __('RSS'), $widget_ops, $control_ops );
 	}