Removing some deprecated members

tests/html/notifications_test.dart

-library NotificationsTest;
-import '../../pkg/unittest/lib/unittest.dart';
-import '../../pkg/unittest/lib/html_individual_config.dart';
-import 'dart:html';
-
-main() {
-  useHtmlIndividualConfiguration();
-
-  group('supported', () {
-    test('supported', () {
-      expect(NotificationCenter.supported, true);
-    });
-  });
-
-  group('unsupported_throws', () {
-    test('createNotification', () {
-      var expectation = NotificationCenter.supported ? returnsNormally : throws;
-      expect(() { window.notifications.createNotification; }, expectation);
-    });
-  });
-
-  group('webkitNotifications', () {
-    if (NotificationCenter.supported) {
-      test('DomException', () {
-        try {
-          window.notifications.createNotification('', '', '');
-        } on DomException catch (e) {
-          expect(e.name, DomException.SECURITY);
-        }
-      });
-
-      /*
-      // Sporadically flaky on Mac Chrome. Uncomment when Issue 8482 is fixed.
-      test('construct notification', () {
-        var note = new Notification('this is a notification');
-        var note2 = new Notification('another notificiation', titleDir: 'foo');
-      });
-      */
-    }
-  });
-}
-