Stop treating StreamController as a Stream.

pkg/http/lib/src/multipart_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 multipart_request;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:math';
 import 'dart:uri';
@@ skipping 105 matching lines @@
       writeAscii(_headerForFile(file));
       return writeStreamToSink(file.finalize(), controller)
         .then((_) => writeLine());
     }).then((_) {
       // TODO(nweiz): pass any errors propagated through this future on to
       // the stream. See issue 3657.
       writeAscii('--$boundary--\r\n');
       controller.close();
     });
 
-    return new ByteStream(controller);
+    return new ByteStream(controller.stream);
   }
 
   /// All character codes that are valid in multipart boundaries. From
   /// http://tools.ietf.org/html/rfc2046#section-5.1.1.
   static final List<int> _BOUNDARY_CHARACTERS = const <int>[
     39, 40, 41, 43, 95, 44, 45, 46, 47, 58, 61, 63, 48, 49, 50, 51, 52, 53, 54,
     55, 56, 57, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80,
     81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 97, 98, 99, 100, 101, 102, 103,
     104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118,
     119, 120, 121, 122
@@ skipping 29 matching lines @@
   String _boundaryString(int length) {
     var prefix = "dart-http-boundary-";
     var list = new List<int>.fixedLength(length - prefix.length);
     for (var i = 0; i < list.length; i++) {
       list[i] = _BOUNDARY_CHARACTERS[
           _random.nextInt(_BOUNDARY_CHARACTERS.length)];
     }
     return "$prefix${new String.fromCharCodes(list)}";
   }
 }