Dartifying dart:html type names.

tests/html/exceptions_test.dart

 library ExceptionsTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:html';
 
 main() {
   useHtmlConfiguration();
-  test('DOMException', () {
+  test('DomException', () {
     try {
       window.webkitNotifications.createNotification('', '', '');
-    } on DOMException catch (e) {
-      expect(e.code, DOMException.SECURITY_ERR);
+    } on DomException catch (e) {
+      expect(e.code, DomException.SECURITY_ERR);
       expect(e.name, 'SECURITY_ERR');
       expect(e.message, 'SECURITY_ERR: DOM Exception 18');
     }
   });
   test('EventException', () {
     final event = new Event('Event');
     // Intentionally do not initialize it!
     try {
       document.$dom_dispatchEvent(event);
     } on EventException catch (e) {
       expect(e.code, EventException.UNSPECIFIED_EVENT_TYPE_ERR);
       expect(e.name, 'UNSPECIFIED_EVENT_TYPE_ERR');
       expect(e.message, 'UNSPECIFIED_EVENT_TYPE_ERR: DOM Events Exception 0');
     }
   });
 }