Index: wp-includes/default-filters.php
===================================================================
--- wp-includes/default-filters.php	(revision 19063)
+++ wp-includes/default-filters.php	(working copy)
@@ -263,6 +263,7 @@
 
 // Navigation menu actions
 add_action( 'delete_post',                '_wp_delete_post_menu_item'         );
+add_action( 'wp_trash_post',              '_wp_delete_post_menu_item'         );
 add_action( 'delete_term',                '_wp_delete_tax_menu_item'          );
 add_action( 'transition_post_status',     '_wp_auto_add_pages_to_menu', 10, 3 );