Migrate dom tests to dart:html.

tests/dom/native_gc_test.dart

 #library('NativeGCTest');
 #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('EventListener', () {
       final int N = 1000000;
       final int M = 1000;
 
       var div;
       for (int i = 0; i < M; ++i) {
         // This memory should be freed when the listener below is
         // collected.
         List l = new List(N);
 
         // Record the iteration number.
         l[N - 1] = i;
 
-        div = document.createElement('div');
-        div.addEventListener('test', (_) {
+        div = new Element.tag('div');
+        div.on['test'].add((_) {
             // Only the final iteration's listener should be invoked.
             // Note: the reference to l keeps the entire list alive.
             Expect.equals(M - 1, l[N - 1]);
           }, false);
       }
 
-      final event = document.createEvent('Event');
-      event.initEvent('test', true, false);
-      div.dispatchEvent(event);
+      final event = new Event('test');
+      div.on['test'].dispatch(event);
   });
 }