Delete a bunch of packages that are now on GitHub.

pkg/watcher/test/no_subscription/polling_test.dart

Index: pkg/watcher/test/no_subscription/polling_test.dart
diff --git a/pkg/watcher/test/no_subscription/polling_test.dart b/pkg/watcher/test/no_subscription/polling_test.dart
deleted file mode 100644
index c71b5ceecbd62f56d1daf800be2bc4d679b22e43..0000000000000000000000000000000000000000
--- a/pkg/watcher/test/no_subscription/polling_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.
-
-import 'package:scheduled_test/scheduled_test.dart';
-import 'package:watcher/watcher.dart';
-
-import 'shared.dart';
-import '../utils.dart';
-
-void main() {
-  initConfig();
-
-  watcherFactory = (dir) => new PollingDirectoryWatcher(dir);
-
-  setUp(createSandbox);
-
-  sharedTests();
-}