Converting tests over to using event streams.

tests/html/inner_frame_test.dart

 library InnerFrameTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:html';
 
 main() {
   if (window != window.top) {
     // Child frame.
 
     // The child's frame should not be able to access its parent's
     // document.
 
-    window.on.message.add((Event e) {
+    window.onMessage.listen((Event e) {
       switch (e.data) {
       case 'frameElement': {
         // Check window.frameElement.
         try {
           var parentDocument = window.frameElement.document;
           var div = parentDocument.$dom_createElement("div");
           div.id = "illegalFrameElement";
           parentDocument.body.nodes.add(div);
           expect(false, isTrue, reason: 'Should not reach here.');
         } on NoSuchMethodError catch (e) {
@@ skipping 43 matching lines @@
   }
 
   // Parent / test frame
   useHtmlConfiguration();
 
   final iframe = new Element.tag('iframe');
   iframe.src = window.location.href;
   var child;
 
   test('prepare', () {
-      iframe.on.load.add(expectAsync1((e) { child = iframe.contentWindow;}));
+      iframe.onLoad.listen(expectAsync1((e) { child = iframe.contentWindow;}));
       document.body.nodes.add(iframe);
     });
 
   final validate = (testName, verify) {
     final expectedVerify = expectAsync0(verify);
-    window.on.message.add((e) {
+    window.onMessage.listen((e) {
       guardAsync(() {
           if (e.data == 'pass_$testName') {
             expectedVerify();
           }
           expect(e.data, isNot(equals('fail_$testName')));
         });
       });
     child.postMessage(testName, '*');
   };
 
@@ skipping 17 matching lines @@
 
   test('parent', () {
       validate('parent', () {
         var div = document.query('#illegalParent');
 
         // Ensure that this parent frame was not modified by its child.
         expect(div, isNull);
       });
     });
 }