Get rid of all the library tags.

test/upgrade/report/leading_character_shows_change_test.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 pub_tests;
-
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   integration("the character before each package describes the change", () {
     servePackages((builder) {
       builder.serve("added", "1.0.0");
       builder.serve("downgraded", "1.0.0");
       builder.serve("downgraded", "2.0.0");
       builder.serve("overridden", "1.0.0");
@@ skipping 65 matching lines @@
 < downgraded .*
 ! overridden .*
 \* source_changed .*
   unchanged .*
 > upgraded .*
 These packages are no longer being depended on:
 - removed .*
 """, multiLine: true));
   });
 }