Get rid of all the library tags.

test/get/hosted/stay_locked_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 pub_tests;
-
 import 'package:path/path.dart' as path;
 import 'package:pub/src/io.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   integration('keeps a pub server package locked to the version in the '
       'lockfile', () {
@@ skipping 11 matching lines @@
 
     // Start serving a newer package as well.
     servePackages((builder) => builder.serve("foo", "1.0.1"));
 
     // This shouldn't upgrade the foo dependency due to the lockfile.
     pubGet();
 
     d.packagesDir({"foo": "1.0.0"}).validate();
   });
 }