Fix dartium that was broken by Completer change.

tools/dom/src/native_DOMPublic.dart

 // Copyright (c) 2011, 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 html;
 
 _makeSendPortFuture(spawnRequest) {
-  final completer = new Completer<SendPort>();
+  final completer = new Completer<SendPort>.sync();

[Anton Muhin, 2013/05/13 09:19:36]

DBQ: do you know why it's needed?

[floitsch, 2013/05/13 09:21:21]

Not completely. There must be something that requires the port to be opened when
the completer is invoked.

[Anton Muhin, 2013/05/14 13:55:33]

Thanks a lot, Florian, I'll have a look.

On 2013/05/13 09:21:21, floitsch wrote:

   final port = new ReceivePort();
   port.receive((result, _) {
     completer.complete(result);
     port.close();
   });
   // TODO: SendPort.hashCode is ugly way to access port id.
   spawnRequest(port.toSendPort().hashCode);
   return completer.future;
 }
 
@@ skipping 19 matching lines @@
   final _NPObject _npObject;
 
   TestRunner._(this._npObject);
 
   display() => _npObject.invoke('display');
   dumpAsText() => _npObject.invoke('dumpAsText');
   notifyDone() => _npObject.invoke('notifyDone');
   setCanOpenWindows() => _npObject.invoke('setCanOpenWindows');
   waitUntilDone() => _npObject.invoke('waitUntilDone');
 }