Attempting to fix IE9 XHR cross domain flakiness.

tools/dom/templates/html/impl/impl_XMLHttpRequest.darttemplate

 // 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.
 
 part of $LIBRARYNAME;
 
 /**
  * A utility for retrieving data from a URL.
  *
  * HttpRequest can be used to obtain data from http, ftp, and file
@@ skipping 232 matching lines @@
     var xhr = JS('var', 'new XDomainRequest()');
     JS('', '#.open(#, #)', xhr, method, url);
     JS('', '#.onload = #', xhr, convertDartClosureToJS((e) {
       var response = JS('String', '#.responseText', xhr);
       completer.complete(response);
     }, 1));
     JS('', '#.onerror = #', xhr, convertDartClosureToJS((e) {
       completer.completeError(e);
     }, 1));
 
+    // IE9 RTM - XDomainRequest issued requests may abort if all event handlers
+    // not specified
+    // http://social.msdn.microsoft.com/Forums/ie/en-US/30ef3add-767c-4436-b8a9-f1ca19b4812e/ie9-rtm-xdomainrequest-issued-requests-may-abort-if-all-event-handlers-not-specified
+    JS('', '#.onprogress = {}', xhr);
+    JS('', '#.ontimeout = {}', xhr);
+    JS('', '#.timeout = Number.MAX_VALUE', xhr);
+
     if (sendData != null) {
       JS('', '#.send(#)', xhr, sendData);
     } else {
       JS('', '#.send()', xhr);
     }
 
     return completer.future;
 $endif
   }
 
 $!MEMBERS
 }