Get rid of all the library tags.

test/cascade_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 shelf.cascade_test;
-
 import 'dart:async';
 
 import 'package:shelf/shelf.dart';
 import 'package:test/test.dart';
 
 import 'test_util.dart';
 
 void main() {
   group('a cascade with several handlers', () {
     var handler;
@@ skipping 118 matching lines @@
     });
 
     test('passing [statusCodes] and [shouldCascade] at the same time fails',
         () {
       expect(() =>
               new Cascade(statusCodes: [404, 405], shouldCascade: (_) => false),
           throwsArgumentError);
     });
   });
 }