Replace the existing unittest APIs with the new runner infrastructure.

test/missing_tick_test.dart

Index: test/missing_tick_test.dart
diff --git a/test/missing_tick_test.dart b/test/missing_tick_test.dart
deleted file mode 100644
index 81b033153206068b3f3267ca9e897721640252a1..0000000000000000000000000000000000000000
--- a/test/missing_tick_test.dart
+++ /dev/null
@@ -1,27 +0,0 @@
-// Copyright (c) 2013, 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 unittest.missing_tick_test;
-
-import 'package:unittest/unittest.dart';
-
-import 'package:metatest/metatest.dart';
-
-void main() => initTests(_test);
-
-void _test(message) {
-  initMetatest(message, timeout: const Duration(seconds: 1));
-
-  expectTestResults('missing tick', () {
-    test('test that should time out', () {
-      expectAsync(() {});
-    });
-  }, [
-    {
-      'description': 'test that should time out',
-      'message': 'Test timed out after 1 seconds.',
-      'result': 'error',
-    }
-  ]);
-}