Error reporting on File in dart:io

runtime/bin/directory_impl.dart

Index: runtime/bin/directory_impl.dart
diff --git a/runtime/bin/directory_impl.dart b/runtime/bin/directory_impl.dart
index 5243345902c347b9ea41997f6da9b2e079db5fdf..0430bac8a055224bbe5afed8d994144b7f02a0ab 100644
--- a/runtime/bin/directory_impl.dart
+++ b/runtime/bin/directory_impl.dart
@@ -3,13 +3,6 @@
 // BSD-style license that can be found in the LICENSE file.
 
 
-// Used for holding error code and error message for failed OS system calls.
-class _OSStatus {
-  int _errorCode;
-  String _errorMessage;
-}
-
-
 class _Directory implements Directory {
   static final kCreateRequest = 0;
   static final kDeleteRequest = 1;
@@ -22,7 +15,7 @@ class _Directory implements Directory {
 
   static String _current() native "Directory_Current";
   static String _createTemp(String template,
-                            _OSStatus status) native "Directory_CreateTemp";
+                            OSError osError) native "Directory_CreateTemp";
   static int _exists(String path) native "Directory_Exists";
   static bool _create(String path) native "Directory_Create";
   static bool _delete(String path, bool recursive) native "Directory_Delete";
@@ -89,8 +82,8 @@ class _Directory implements Directory {
   }
 
   void createTempSync() {
-    var status = new _OSStatus();
-    var result = _createTemp(path, status);
+    var osError = new OSError();
+    var result = _createTemp(path, osError);
     if (result != null) {
       _path = result;
     } else {