Update pkg/http to use the new async APIs.

pkg/http/lib/src/io_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 io_client;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'base_client.dart';
@@ skipping 24 matching lines @@
         // onRequest or onResponse callbacks get passed to onError. If the
         // completer has already fired, we want to re-throw those exceptions
         // to the top level so that they aren't silently ignored.
         if (completed) throw e;
 
         completed = true;
         completer.completeError(e);
       });
     };
 
+    var pipeCompleter = new Completer();
     connection.onRequest = (underlyingRequest) {
       underlyingRequest.contentLength = request.contentLength;
       underlyingRequest.persistentConnection = request.persistentConnection;
       request.headers.forEach((name, value) {
         underlyingRequest.headers.set(name, value);
       });
 
-      if (stream.closed) {
-        underlyingRequest.outputStream.close();
-      } else {
-        stream.pipe(underlyingRequest.outputStream);
-      }
+      chainToCompleter(
+          stream.pipe(wrapOutputStream(underlyingRequest.outputStream)),
+          pipeCompleter);
     };
 
     connection.onResponse = (response) {
       var headers = <String>{};
       response.headers.forEach((key, value) => headers[key] = value);
 
       if (completed) return;
 
       completed = true;
       completer.complete(new StreamedResponse(
-          response.inputStream,
+          wrapInputStream(response.inputStream),
           response.statusCode,
           response.contentLength,
           request: request,
           headers: headers,
           isRedirect: response.isRedirect,
           persistentConnection: response.persistentConnection,
           reasonPhrase: response.reasonPhrase));
     };
 
-    return completer.future;
+    return pipeCompleter.future.then((_) => completer.future);
   }
 
   /// Closes the client. This terminates all active connections. If a client
   /// remains unclosed, the Dart process may not terminate.
   void close() {
     if (_inner != null) _inner.shutdown(force: true);
     _inner = null;
   }
 }