Get rid of all the library tags.

test/transformer/a_transformer_rejects_its_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_test.dart';
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import '../serve/utils.dart';
 
 const REJECT_CONFIG_TRANSFORMER = """
 import 'dart:async';
 
 import 'package:barback/barback.dart';
@@ skipping 23 matching lines @@
        ])])
      ]).create();
 
      pubGet();
      var pub = startPubServe();
      pub.stderr.expect(endsWith('Error loading transformer: I hate these '
          'settings!'));
      pub.shouldExit(1);
    });
 }