Initialize in the Theme_Upgrader class. props mitchoyoshitaka, fixes …

…#18367.

git-svn-id: http://svn.automattic.com/wordpress/trunk@18525 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-upgrader.php

@@ -604,6 +604,7 @@ function delete_old_plugin($removed, $local_destination, $remote_destination, $p
 class Theme_Upgrader extends WP_Upgrader {
 
 	var $result;
+	var $bulk = false;
 
 	function upgrade_strings() {
 		$this->strings['up_to_date'] = __('The theme is at the latest version.');