Remove explicit delayed futures in dart:io.

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>> {
   final int _transferLength;
   final Completer _dataCompleter = new Completer();
   Stream<List<int>> _stream;
@@ skipping 562 matching lines @@
               },
               onError: (error) {
                 if (!_done(error)) {
                   _closeCompleter.completeError(error);
                 }
               });
   }
 
   bool _done([error]) {
     if (_completer == null) return false;
-    var tmp = _completer;
+    if (error != null) {
+      _completer.completeError(error);
+    } else {
+      _completer.complete(_outbound);
+    }
     _completer = null;
-    if (error != null) {
-      tmp.completeError(error);
-    } else {
-      tmp.complete(_outbound);
-    }
     return true;
   }
 
   Future addStream(var stream) {
     _ensureController();
     _completer = new Completer();
     _subscription = stream.listen(
         (data) {
           _controller.add(data);
         },
@@ skipping 1713 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;
 }