Update pkg/http to use the new async APIs.

pkg/http/lib/src/base_client.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 base_client;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:scalarlist';
 import 'dart:uri';
@@ skipping 80 matching lines @@
   Future<Uint8List> readBytes(url, {Map<String, String> headers}) {
     return get(url, headers: headers).then((response) {
       _checkResponseSuccess(url, response);
       return response.bodyBytes;
     });
   }
 
   /// Sends an HTTP request and asynchronously returns the response.
   ///
   /// Implementers should call [BaseRequest.finalize] to get the body of the
-  /// request as an [InputStream]. They shouldn't make any assumptions about the
+  /// request as a [ByteStream]. They shouldn't make any assumptions about the
   /// state of the stream; it could have data written to it asynchronously at a
   /// later point, or it could already be closed when it's returned.
   Future<StreamedResponse> send(BaseRequest request);
 
   /// Sends a non-streaming [Request] and returns a non-streaming [Response].
   Future<Response> _sendUnstreamed(
       String method, url, Map<String, String> headers,
       [Map<String, String> fields]) {
     // Wrap everything in a Future block so that synchronous validation errors
     // are passed asynchronously through the Future chain.
@@ skipping 16 matching lines @@
       message = "$message: ${response.reasonPhrase}";
     }
     throw new HttpException("$message.");
   }
 
   /// Closes the client and cleans up any resources associated with it. It's
   /// important to close each client when it's done being used; failing to do so
   /// can cause the Dart process to hang.
   void close() {}
 }