Remove AsyncError with Expando.

pkg/http/test/request_test.dart

 // Copyright (c) 2013, 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.
 
 library request_test;
 
 import 'dart:io';
 
 import 'package:http/http.dart' as http;
 import 'package:http/src/utils.dart';
@@ skipping 197 matching lines @@
 
   test('#maxRedirects', () {
     print("This test is known to be flaky, please ignore "
           "(debug prints below added by sgjesse@)");
     print("#maxRedirects test starting server...");
     expect(startServer().then((_) {
       print("#maxRedirects test server running");
 
       var request = new http.Request('POST', serverUrl.resolve('/loop?1'))
         ..maxRedirects = 2;
-      var future = request.send().catchError((e) {
+      var future = request.send().catchError((error) {
         print("#maxRedirects test exception received");
-        expect(e.error, isRedirectLimitExceededException);
-        expect(e.error.redirects.length, equals(2));
+        expect(error, isRedirectLimitExceededException);
+        expect(error.redirects.length, equals(2));
       });
       expect(future.catchError((_) {}).then((_) {
         print("#maxRedirects test stopping server...");
         stopServer();
         print("#maxRedirects test server stopped");
       }), completes);
 
       expect(future, completes);
       print("#maxRedirects test started");
     }), completes);
@@ skipping 156 matching lines @@
   });
 
   group('#toString()', () {
     test('includes the method and URL', () {
       var request = new http.Request('POST', dummyUrl);
       expect(request.toString(), 'POST $dummyUrl');
     });
   });
 }