Get rid of all the library tags.

test/dependency_computer/transformers_needed_by_library_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("reports a dependency if the library itself is transformed", () {
     d.dir(appPath, [
       d.pubspec({
         "name": "myapp",
         "dependencies": {"foo": {"path": "../foo"}},
@@ skipping 87 matching lines @@
     ]).create();
 
     d.dir("foo", [
       d.pubspec({"name": "foo", "version": "1.0.0"}),
       d.dir("lib", [d.file("foo.dart", transformer())])
     ]).create();
 
     expectLibraryDependencies('myapp|bin/myapp.dart', []);
   });
 }