Index: wp-admin/includes/class-wp-filesystem-direct.php
===================================================================
--- wp-admin/includes/class-wp-filesystem-direct.php	(revision 7538)
+++ wp-admin/includes/class-wp-filesystem-direct.php	(working copy)
@@ -37,6 +37,9 @@
 	function cwd(){
 		return @getcwd();
 	}
+	function chdir($dir){
+		return @chdir($dir);
+	}
 	function chgrp($file,$group,$recursive=false){
 		if( ! $this->exists($file) )
 			return false;