Workaround Dartium limitation in event_test

tests/html/event_test.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.
 
 library EventTest;
 import "package:expect/expect.dart";
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_config.dart';
 import 'dart:html';
 
@@ skipping 161 matching lines @@
   //   expect(ev.elapsedTime, 0.5);
   // });
 
   eventTest('UIEvent', () => new UIEvent('foo', view: window, detail: 12),
       (ev) {
     expect(window, ev.view);
     expect(12, ev.detail);
   });
 
   eventTest('WheelEvent',
-      () => new WheelEvent("mousewheel", view: window, deltaX: 1, deltaY: 0,
+      // TODO(alanknight): Can't pass window on Dartium. Add view: window
+      // once going through JS.
+      () => new WheelEvent("mousewheel", deltaX: 1, deltaY: 0,
           detail: 4, screenX: 3, screenY: 4, clientX: 5, clientY: 6,
           ctrlKey: true, altKey: true, shiftKey: true, metaKey: true),
       (ev) {
     expect(ev.deltaX, 1);
     expect(ev.deltaY, 0);
     expect(ev.screen.x, 3);
     expect(ev.screen.y, 4);
     expect(ev.client.x, 5);
     expect(ev.client.y, 6);
     expect(ev.ctrlKey, isTrue);
     expect(ev.altKey, isTrue);
     expect(ev.shiftKey, isTrue);
     expect(ev.metaKey, isTrue);
   }, 'mousewheel');
 }