Fix unresolved classes issues in dart:io.

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.
 
 
 class _Directory implements Directory {
   static const CREATE_REQUEST = 0;
   static const DELETE_REQUEST = 1;
   static const EXISTS_REQUEST = 2;
   static const CREATE_TEMP_REQUEST = 3;
@@ skipping 48 matching lines @@
       } else {
         future = future.chain((index) {
           if (index != -1) {
             return new Future.immediate(index);
           }
           return dirsToCreate[i].exists().transform((e) => e ? i : -1);
         });
       }
     }
     if (future == null) {
-      return new Future.immedidate(-1);
+      return new Future.immediate(-1);
     } else {
       return future;
     }
   }
 
   Future<Directory> createRecursively() {
     if (_path is !String) {
       throw new ArgumentError();
     }
     var path = new Path.fromNative(_path);
@@ skipping 257 matching lines @@
     } else {
       throw e;
     }
   }
 
   Function _onDir;
   Function _onFile;
   Function _onDone;
   Function _onError;
 }