Remove unittest and matcher from the repo.

pkg/unittest/test/protect_async_test.dart

-// 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.protect_async_test;
-
-import 'dart:async';
-
-import 'package:unittest/unittest.dart';
-
-import 'package:metatest/metatest.dart';
-
-void main() => initTests(_test);
-
-void _test(message) {
-  initMetatest(message);
-
-  expectTestResults('protectAsync', () {
-    test('protectAsync0', () {
-      var protected = () {
-        throw new StateError('error during protectAsync0');
-      };
-      new Future(protected);
-    });
-
-    test('protectAsync1', () {
-      var protected = (arg) {
-        throw new StateError('error during protectAsync1: $arg');
-      };
-      new Future(() => protected('one arg'));
-    });
-
-    test('protectAsync2', () {
-      var protected = (arg1, arg2) {
-        throw new StateError('error during protectAsync2: $arg1, $arg2');
-      };
-      new Future(() => protected('arg1', 'arg2'));
-    });
-
-    test('throw away 1', () {
-      return new Future(() {});
-    });
-  }, [{
-    'result': 'error',
-    'message': 'Caught Bad state: error during protectAsync0'
-  }, {
-    'result': 'error',
-    'message': 'Caught Bad state: error during protectAsync1: one arg'
-  }, {
-    'result': 'error',
-    'message': 'Caught Bad state: error during protectAsync2: arg1, arg2'
-  }, {
-    'result': 'pass',
-    'message': ''
-  }]);
-}