Missed two files that needed dart:async import.

pkg/intl/lib/src/http_request_data_reader.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.
 
 /**
  * This contains a reader that accesses data using the HttpRequest
  * facility, and thus works only in the web browser.
  */
 
 library http_request_data_reader;
 
+import 'dart:async';
 import 'dart:html';
 import 'intl_helpers.dart';
 
 class HTTPRequestDataReader implements LocaleDataReader {
 
   /** The base url from which we read the data. */
   String url;
   HTTPRequestDataReader(this.url);
 
   Future read(String locale) {
     var completer = new Completer();
     var source = '$url$locale.json';
     var request = new HttpRequest.get(
         source,
         (req) => completer.complete(req.responseText));
     return completer.future;
  }
 }