Delete a bunch of packages that are now on GitHub.

pkg/scheduled_test/lib/src/descriptor/nothing_descriptor.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 descriptor.nothing;
-
-import 'dart:async';
-import 'dart:io';
-
-import 'package:path/path.dart' as path;
-
-import '../../descriptor.dart';
-import '../../scheduled_test.dart';
-import '../utils.dart';
-
-/// A descriptor that validates that no file exists with the given name.
-/// Creating this descriptor is a no-op and loading from it is invalid.
-class NothingDescriptor extends Descriptor {
-  NothingDescriptor(String name)
-      : super(name);
-
-  Future create([String parent]) => new Future.value();
-
-  Future validate([String parent]) => schedule(() => validateNow(parent),
-      "validating '$name' doesn't exist");
-
-  Future validateNow([String parent]) => syncFuture(() {
-    if (parent == null) parent = defaultRoot;
-    var fullPath = path.join(parent, name);
-    if (new File(fullPath).existsSync()) {
-      fail("Expected nothing to exist at '$fullPath', but found a file.");
-    } else if (new Directory(fullPath).existsSync()) {
-      fail("Expected nothing to exist at '$fullPath', but found a directory.");
-    } else if (new Link(fullPath).existsSync()) {
-      fail("Expected nothing to exist at '$fullPath', but found a link.");
-    } else {
-      return;
-    }
-  });
-
-  String describe() => "nothing at '$name'";
-}