Get rid of all the library tags.

test/lock_file_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 lock_file_test;
-
 import 'dart:async';
 
 import 'package:pub/src/lock_file.dart';
 import 'package:pub/src/package.dart';
 import 'package:pub/src/pubspec.dart';
 import 'package:pub/src/source.dart';
 import 'package:pub/src/source_registry.dart';
 import 'package:pub_semver/pub_semver.dart';
 import 'package:test/test.dart';
 import 'package:yaml/yaml.dart';
@@ skipping 202 matching lines @@
           'bar': {
             'version': '3.2.1',
             'source': 'mock',
             'description': 'bar desc'
           }
         }
       }));
     });
   });
 }