Fix breakage from r28097

sdk/lib/io/directory_impl.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart.io;
 
 class _Directory extends FileSystemEntity implements Directory {
   final String path;
 
   _Directory(String this.path) {
@@ skipping 174 matching lines @@
                                    fullTemplate,
                                    result);
     }
     return new Directory(result);
   }
 
   static Future<Directory> createSystemTemp(String template) {
     return _IOService.dispatch(_DIRECTORY_CREATE_SYSTEM_TEMP,
                                [template]).then((response) {
       if (response is List && response[0] != _SUCCESS_RESPONSE) {
-        throw new Directory(template)._exceptionOrErrorFromResponse(
+        throw new _Directory(template)._exceptionOrErrorFromResponse(
             response, "Creation of temporary directory failed");
       }
       return new Directory(response);
     });
   }
 
   static Directory createSystemTempSync(String template) {
     var result = _createTemp(template, true);
     if (result is OSError) {
       throw new DirectoryException("Creation of temporary directory failed",
@@ skipping 202 matching lines @@
       controller.addError(
           new DirectoryException("Directory listing failed",
                                  errorPath,
                                  err));
     } else {
       controller.addError(
           new DirectoryException("Internal error"));
     }
   }
 }