Implements hook_system_info_alter().
function system_system_info_alter(&$info, $file, $type) {
// Remove page-top and page-bottom from the blocks UI since they are reserved for
// modules to populate from outside the blocks system.
if ($type == 'theme') {
$info['regions_hidden'][] = 'page_top';
$info['regions_hidden'][] = 'page_bottom';
}
}