Get rid of all the library tags.

test/get/hosted/avoid_network_requests_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:scheduled_test/scheduled_test.dart';
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   integration('only requests versions that are needed during solving', () {
     servePackages((builder) {
       builder.serve("foo", "1.0.0");
       builder.serve("foo", "1.1.0");
@@ skipping 33 matching lines @@
     getRequestedPaths().then((paths) {
       expect(paths, unorderedEquals([
         // Bar should be requested because it's new, but not foo.
         "api/packages/bar",
         // Need to download it.
         "packages/bar/versions/1.2.0.tar.gz"
       ]));
     });
   });
 }