Future-ify all the html methods and add named parameters

tests/html/xhr_test.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 XHRTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:async';
 import 'dart:html';
 import 'dart:json' as json;
@@ skipping 35 matching lines @@
 
   group('supported_onLoadEnd', () {
     test('supported', () {
       expect(HttpRequest.supportsLoadEndEvent, isTrue);
     });
   });
 
   group('xhr', () {
     test('XHR No file', () {
       HttpRequest xhr = new HttpRequest();
-      xhr.open("GET", "NonExistingFile", true);
+      xhr.open("GET", "NonExistingFile", async: true);
       xhr.onReadyStateChange.listen(expectAsyncUntil1((event) {
         if (xhr.readyState == HttpRequest.DONE) {
           validate404(xhr);
         }
       }, () => xhr.readyState == HttpRequest.DONE));
       xhr.send();
     });
 
     test('XHR file', () {
       var loadEndCalled = false;
 
       var xhr = new HttpRequest();
-      xhr.open('GET', url, true);
+      xhr.open('GET', url, async: true);
       xhr.onReadyStateChange.listen(expectAsyncUntil1((e) {
         if (xhr.readyState == HttpRequest.DONE) {
           validate200Response(xhr);
 
           Timer.run(expectAsync0(() {
             expect(loadEndCalled, HttpRequest.supportsLoadEndEvent);
           }));
         }
       }, () => xhr.readyState == HttpRequest.DONE));
 
@@ skipping 77 matching lines @@
     test('HttpRequestProgressEvent', () {
       var expectation = HttpRequestProgressEvent.supported ?
           returnsNormally : throws;
       expect(() {
         var event = new Event.eventType('XMLHttpRequestProgressEvent', '');
         expect(event is HttpRequestProgressEvent, isTrue);
       }, expectation);
     });
   });
 }