Get rid of all the library tags.

test/cache/repair/reinstalls_hosted_packages_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.
 
-library pub_tests;
-
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   integration('reinstalls previously cached hosted packages', () {
     servePackages((builder) {
       builder.serve("foo", "1.2.3");
       builder.serve("foo", "1.2.4");
       builder.serve("foo", "1.2.5");
       builder.serve("bar", "1.2.3");
@@ skipping 29 matching lines @@
           Reinstalled 3 packages.''');
 
     // The broken versions should have been replaced.
     d.hostedCache([
       d.dir("bar-1.2.4", [d.nothing("broken.txt")]),
       d.dir("foo-1.2.3", [d.nothing("broken.txt")]),
       d.dir("foo-1.2.5", [d.nothing("broken.txt")])
     ]).validate();
   });
 }