Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/global/deactivate/missing_package_arg_test.dart

-// Copyright (c) 2014, 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 '../../../lib/src/exit_codes.dart' as exit_codes;
-import '../../test_pub.dart';
-
-main() {
-  initConfig();
-  integration('fails if no package was given', () {
-    schedulePub(args: ["global", "deactivate"],
-        error: """
-            No package to deactivate given.
-
-            Usage: pub global deactivate <package>
-            -h, --help    Print this usage information.
-
-            Run "pub help" to see global options.
-            """,
-        exitCode: exit_codes.USAGE);
-  });
-}