Update pkg/http to use the new async APIs.

pkg/http/test/request_test.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.
 
 library request_test;
 
 import 'dart:io';
 
 import 'package:unittest/unittest.dart';
 import 'package:http/http.dart' as http;
 import 'package:http/src/utils.dart';
 import 'utils.dart';
 
 void main() {
   test('.send', () {
     startServer();
 
     var request = new http.Request('POST', serverUrl);
     request.body = "hello";
-    var future = request.send().then((response) {
+
+    expect(request.send().then((response) {
       expect(response.statusCode, equals(200));
-      return consumeInputStream(response.stream);
-    }).then((bytes) => new String.fromCharCodes(bytes));
-    future.catchError((_) {}).then(expectAsync1((_) {
-      stopServer();
-    }));
-
-    expect(future, completion(parse(equals({
+      return response.stream.bytesToString();
+    }).whenComplete(stopServer), completion(parse(equals({
       'method': 'POST',
       'path': '/',
       'headers': {
         'content-type': ['text/plain; charset=UTF-8'],
         'content-length': ['5']
       },
       'body': 'hello'
     }))));
   });
 
@@ skipping 270 matching lines @@
       request.body = '{"hello": "world"}';
       expect(request.headers[HttpHeaders.CONTENT_TYPE],
           equals('application/json; charset=iso-8859-1'));
     });
   });
 
   group('#finalize', () {
     test('returns a stream that emits the request body', () {
       var request = new http.Request('POST', dummyUrl);
       request.body = "Hello, world!";
-      expect(
-          consumeInputStream(request.finalize())
-              .then((bytes) => new String.fromCharCodes(bytes)),
+      expect(request.finalize().bytesToString(),
           completion(equals("Hello, world!")));
     });
 
     test('freezes #persistentConnection', () {
       var request = new http.Request('POST', dummyUrl);
       request.finalize();
 
       expect(request.persistentConnection, isTrue);
       expect(() => request.persistentConnection = false, throwsStateError);
     });
@@ skipping 57 matching lines @@
   });
 
   group('#toString()', () {
     test('includes the method and URL', () {
       var request = new http.Request('POST', dummyUrl);
       expect(request.toString(), 'POST $dummyUrl');
     });
   });
 }