Stop treating StreamController as a Stream.

pkg/http/lib/src/streamed_request.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 streamed_request;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:uri';
 
@@ skipping 22 matching lines @@
   /// Creates a new streaming request.
   StreamedRequest(String method, Uri url)
     : super(method, url),
       _controller = new StreamController<List<int>>();
 
   /// Freezes all mutable fields other than [stream] and returns a
   /// single-subscription [ByteStream] that emits the data being written to
   /// [sink].
   ByteStream finalize() {
     super.finalize();
-    return new ByteStream(_controller);
+    return new ByteStream(_controller.stream);
   }
 }