Remove unittest and matcher from the repo.

pkg/matcher/test/mirror_matchers_test.dart

-// Copyright (c) 2012, 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 matcher.mirror_test;
-
-import 'package:matcher/mirror_matchers.dart';
-import 'package:unittest/unittest.dart' show test;
-
-import 'test_utils.dart';
-
-class C {
-  var instanceField = 1;
-  get instanceGetter => 2;
-  static var staticField = 3;
-  static get staticGetter => 4;
-}
-
-void main() {
-
-  initUtils();
-
-  test('hasProperty', () {
-    var foo = [3];
-    shouldPass(foo, hasProperty('length', 1));
-    shouldFail(foo, hasProperty('foo'), 'Expected: has property "foo" '
-        'Actual: [3] '
-        'Which: has no property named "foo"');
-    shouldFail(foo, hasProperty('length', 2),
-        'Expected: has property "length" which matches <2> '
-        'Actual: [3] '
-        'Which: has property "length" with value <1>');
-    var c = new C();
-    shouldPass(c, hasProperty('instanceField', 1));
-    shouldPass(c, hasProperty('instanceGetter', 2));
-    shouldFail(c, hasProperty('staticField'),
-        'Expected: has property "staticField" '
-        'Actual: <Instance of \'C\'> '
-        'Which: has a member named "staticField",'
-        ' but it is not an instance property');
-    shouldFail(c, hasProperty('staticGetter'),
-        'Expected: has property "staticGetter" '
-        'Actual: <Instance of \'C\'> '
-        'Which: has a member named "staticGetter",'
-        ' but it is not an instance property');
-  });
-}