Get rid of all the library tags.

test/transformer/loads_a_diamond_transformer_dependency_graph_test.dart

 // Copyright (c) 2013, 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 '../descriptor.dart' as d;
 import '../test_pub.dart';
 import '../serve/utils.dart';
 
 main() {
    integration("loads a diamond transformer dependency graph", () {
      serveBarback();
 
      d.dir("top", [
        d.pubspec({
@@ skipping 58 matching lines @@
      ]).create();
 
      pubGet();
      pubServe();
      requestShouldSucceed("main.dart",
          'const TOKEN = "(((main.dart, (left, top)), (right, top)), ((myapp, '
          '(left, top)), (right, top)))";');
      endPubServe();
    });
 }