Remove uses of unittest in the HTML tests where possible.

pkg/dev_compiler/test/codegen/lib/html/notification_test.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library notification_test;
-
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_individual_config.dart';
 import 'dart:html';
 
+import 'package:expect/minitest.dart';
+
 main() {
-  useHtmlIndividualConfiguration();
-
   group('supported_notification', () {
     test('supported', () {
       expect(Notification.supported, true);
     });
   });
 
   group('constructors', () {
     // Test that we create the notification and that the parameters have
     // the expected values. Note that these won't actually display, because
     // we haven't asked for permission, which would have to be done
@@ skipping 16 matching lines @@
         expect(allSpecified.body, "All parameters set");
         var icon = allSpecified.icon;
         var tail = Uri.parse(icon).pathSegments.last;
         expect(tail, "icon.png");
         expect(allSpecified.tag, "tag");
         expect(allSpecified.lang, "en_US");
       }, expectation);
     });
   });
 }