Get rid of all the library tags.

test/utils.dart

 // Copyright (c) 2013, 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 test_utils;
-
 import 'dart:convert';
 
 import 'package:http/http.dart' as http;
 import 'package:http_parser/http_parser.dart';
 import 'package:unittest/unittest.dart';
 
 /// A dummy URL for constructing requests that won't be sent.
 Uri get dummyUrl => Uri.parse('http://dartlang.org/');
 
 /// Removes eight spaces of leading indentation from a multiline string.
@@ skipping 92 matching lines @@
   expect(error, new isInstanceOf<http.ClientException>());
   expect(error.message, message);
   return true;
 });
 
 /// A matcher that matches function or future that throws a
 /// [http.ClientException] with the given [message].
 ///
 /// [message] can be a String or a [Matcher].
 Matcher throwsClientException(message) => throwsA(isClientException(message));