Index: includes/menu.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/menu.inc,v
retrieving revision 1.414
diff -u -p -r1.414 menu.inc
--- includes/menu.inc	8 Oct 2010 05:07:53 -0000	1.414
+++ includes/menu.inc	19 Oct 2010 15:18:30 -0000
@@ -3523,7 +3523,6 @@ function _menu_router_save($menu, $masks
       'theme_callback',
       'theme_arguments',
       'type',
-      'block_callback',
       'description',
       'position',
       'weight',
@@ -3554,7 +3553,6 @@ function _menu_router_save($menu, $masks
       'theme_callback' => $item['theme callback'],
       'theme_arguments' => serialize($item['theme arguments']),
       'type' => $item['type'],
-      'block_callback' => $item['block callback'],
       'description' => $item['description'],
       'position' => $item['position'],
       'weight' => $item['weight'],
Index: modules/system/system.admin.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.admin.inc,v
retrieving revision 1.320
diff -u -p -r1.320 system.admin.inc
--- modules/system/system.admin.inc	15 Oct 2010 04:23:18 -0000	1.320
+++ modules/system/system.admin.inc	19 Oct 2010 15:18:32 -0000
@@ -34,10 +34,6 @@ function system_admin_config_page() {
       }
       $block = $item;
       $block['content'] = '';
-      if ($item['block_callback'] && function_exists($item['block_callback'])) {
-        $function = $item['block_callback'];
-        $block['content'] .= $function();
-      }
       $block['content'] .= theme('admin_block_content', array('content' => system_admin_menu_block($item)));
       if (!empty($block['content'])) {
         $block['show'] = TRUE;
Index: modules/system/system.install
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.install,v
retrieving revision 1.519
diff -u -p -r1.519 system.install
--- modules/system/system.install	15 Oct 2010 18:03:43 -0000	1.519
+++ modules/system/system.install	19 Oct 2010 15:18:33 -0000
@@ -1092,13 +1092,6 @@ function system_schema() {
         'not null' => TRUE,
         'default' => 0,
       ),
-      'block_callback' => array(
-        'description' => 'Name of a function used to render the block on the system administration page for this item.',
-        'type' => 'varchar',
-        'length' => 255,
-        'not null' => TRUE,
-        'default' => '',
-      ),
       'description' => array(
         'description' => 'A description of this item.',
         'type' => 'text',