Re-apply "Remove unittest and matcher from the repo."

pkg/unittest/test/runtests_without_tests_test.dart

Index: pkg/unittest/test/runtests_without_tests_test.dart
diff --git a/pkg/unittest/test/runtests_without_tests_test.dart b/pkg/unittest/test/runtests_without_tests_test.dart
deleted file mode 100644
index 4257ddaa381e305f0480e3a47144b80623ae23c8..0000000000000000000000000000000000000000
--- a/pkg/unittest/test/runtests_without_tests_test.dart
+++ /dev/null
@@ -1,19 +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.runtests_without_tests;
-
-import 'package:unittest/unittest.dart';
-
-import 'package:metatest/metatest.dart';
-
-void main() => initTests(_test);
-
-void _test(message) {
-  initMetatest(message);
-
-  expectTestResults('runTests() without tests', () {
-    group('no tests', () {});
-  }, []);
-}