Delete a bunch of packages that are now on GitHub.

pkg/scheduled_test/test/unittest_compatibility_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.
-
-// This isn't a common use-case, but we want to make sure scheduled_test doesn't
-// step on unittest's toes too much.
-import 'dart:async';
-
-import 'package:scheduled_test/scheduled_test.dart' as scheduled_test;
-import 'package:unittest/unittest.dart' as unittest;
-
-void main() {
-  scheduled_test.test('scheduled_test throws', () {
-    scheduled_test.expect(new Future.error('foo'),
-        scheduled_test.throwsA('foo'));
-  });
-
-  unittest.test('unittest throws', () {
-    // We test a future matcher because scheduled_test modifies some of
-    // unittest's asynchrony infrastructure.
-    unittest.expect(new Future.error('foo'), unittest.throwsA('foo'));
-  });
-}