Get rid of all the library tags.

test/transformer/multiple_transformers_reject_their_config_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS d.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_stream.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import '../serve/utils.dart';
 
 const REJECT_CONFIG_TRANSFORMER = """
 import 'dart:async';
 
@@ skipping 33 matching lines @@
       // We should see three instances of the error message, once for each
       // use of the transformer.
       var pub = startPubServe();
       for (var i = 0; i < 3; i++) {
         pub.stderr.expect(consumeThrough(endsWith('Error loading transformer: '
             'I hate these settings!')));
       }
       pub.shouldExit(1);
     });
 }