Improve support for HTTP 1.0 clients

sdk/lib/io/http_impl.dart

 // Copyright (c) 2013, 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.
 
 part of dart.io;
 
 class _HttpIncoming
     extends Stream<List<int>> implements StreamSink<List<int>> {
   final int _transferLength;
   final Completer _dataCompleter = new Completer();
@@ skipping 373 matching lines @@
     bool _tmpIgnoreBody = _ignoreBody;
     _ignoreBody = false;
     _headersWritten = true;
     _writeHeader();
     _ignoreBody = _tmpIgnoreBody;
     if (_ignoreBody) {
       super.close();
       return;
     }
     _chunked = headers.chunkedTransferEncoding;
-    if (!_chunked) {
+    if (headers.contentLength >= 0) {
       _outgoing.setTransferLength(headers.contentLength);
     }
   }
 
   void _writeHeader();  // TODO(ajohnsen): Better name.
 
   final _HttpHeaders headers;
 
   final _HttpOutgoing _outgoing;
   bool _headersWritten = false;
@@ skipping 1216 matching lines @@
 
 
 class _RedirectInfo implements RedirectInfo {
   const _RedirectInfo(int this.statusCode,
                       String this.method,
                       Uri this.location);
   final int statusCode;
   final String method;
   final Uri location;
 }