Migrate dom tests to dart:html.

tests/dom/callbacks_test.dart

Index: tests/dom/callbacks_test.dart
diff --git a/tests/dom/callbacks_test.dart b/tests/dom/callbacks_test.dart
index a12a02c14e93b049603338c65f6a350454d10189..cc8b2c961d2bbbec5cc838f18b009266f6b523df 100644
--- a/tests/dom/callbacks_test.dart
+++ b/tests/dom/callbacks_test.dart
@@ -1,10 +1,10 @@
 #library('CallbacksTest');
 #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('RequestAnimationFrameCallback', () {
     window.webkitRequestAnimationFrame((int time) => false);
   });