Get rid of all the library tags.

test/dependency_computer/dev_transformers_test.dart

 // Copyright (c) 2014, 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';
 import 'utils.dart';
 
 void main() {
   integration("doesn't return a dependency's transformer that can't run on lib",
       () {
     d.dir(appPath, [
       d.pubspec({
         "name": "myapp",
@@ skipping 101 matching lines @@
       ]),
       d.dir("test", [d.file("foo_test.dart", "")])
     ]).create();
 
     expectDependencies({
       'foo/bar': [],
       'myapp': ['foo/bar']
     });
   });
 }