Migrate dom tests to dart:html.

tests/dom/events_test.dart

 #library('EventsTest');
 #import('../../lib/unittest/unittest.dart');
-#import('../../lib/unittest/dom_config.dart');
-#import('dart:dom');
+#import('../../lib/unittest/html_config.dart');
+#import('dart:html');
 
 main() {
-  useDomConfiguration();
+  useHtmlConfiguration();
   test('TimeStamp', () {
-    Event event = document.createEvent('Event');
+    Event event = new Event('test');
 
     int timeStamp = event.timeStamp;
     Expect.isTrue(timeStamp > 0);
   });
-  // The next test is not asynchronous because [dispatchEvent] fires the event
+  // The next test is not asynchronous because [on['test'].dispatch(event)] fires the event
   // and event listener synchronously.
   test('EventTarget', () {
-    HTMLElement element = window.document.createElement('test');
+    Element element = new Element.tag('test');
     element.id = 'eventtarget';
-    window.document.body.appendChild(element);
+    window.document.body.nodes.add(element);
 
     int invocationCounter = 0;
     void handler(Event e) {
       Expect.equals('test', e.type);
-      HTMLElement target = e.target;
+      Element target = e.target;
       Expect.identical(element, target);
       invocationCounter++;
     }
 
-    Event event = window.document.createEvent('Event');
-    event.initEvent('test', true, false);
+    Event event = new Event('test');
 
     invocationCounter = 0;
-    element.dispatchEvent(event);
+    element.on['test'].dispatch(event);
     Expect.equals(0, invocationCounter);
 
-    element.addEventListener('test', handler, false);
+    element.on['test'].add(handler, false);
     invocationCounter = 0;
-    element.dispatchEvent(event);
+    element.on['test'].dispatch(event);
     Expect.equals(1, invocationCounter);
 
-    element.removeEventListener('test', handler, false);
+    element.on['test'].remove(handler, false);
     invocationCounter = 0;
-    element.dispatchEvent(event);
+    element.on['test'].dispatch(event);
     Expect.equals(0, invocationCounter);
 
-    element.addEventListener('test', handler, false);
+    element.on['test'].add(handler, false);
     invocationCounter = 0;
-    element.dispatchEvent(event);
+    element.on['test'].dispatch(event);
     Expect.equals(1, invocationCounter);
 
-    element.addEventListener('test', handler, false);
+    element.on['test'].add(handler, false);
     invocationCounter = 0;
-    element.dispatchEvent(event);
+    element.on['test'].dispatch(event);
     Expect.equals(1, invocationCounter);
   });
   test('InitMouseEvent', () {
-    HTMLDivElement div = window.document.createElement('div');
-    MouseEvent event = window.document.createEvent('MouseEvent');
-    event.initMouseEvent('zebra', true, true, window, 0, 1, 2, 3, 4, false, false, false, false, 0, div);
+    DivElement div = new Element.tag('div');
+    MouseEvent event = document.$dom_createEvent('MouseEvent');
+    event.$dom_initMouseEvent('zebra', true, true, window, 0, 1, 2, 3, 4, false, false, false, false, 0, div);
   });
 }