Get rid of all the library tags.

test/hmac_sha256_test.dart

 // Copyright (c) 2012, 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 tag to allow the test to run on Dartium.
-library hmac_sha256_test;
-
 import "package:crypto/crypto.dart";
 import "package:test/test.dart";
 
 import 'utils.dart';
 
 void main() {
   group("standard vector", () {
     for (var i = 0; i < _inputs.length; i++) {
       test(_macs[i], () {
         expectHmacEquals(new SHA256(), _inputs[i], _keys[i], _macs[i]);
@@ skipping 681 matching lines @@
   '988d4a6fa87f8138d754c5de9d176c45eaccf8eb8ca1799d87c8f04a966b6f4c',
   'ee6492a669e22bcf19bbdfc45495cd0efa9c2f2ef5d42831e3f13a545cbcd6a1',
   '9611e838fb1d816a0ff9cd269217d93258c34df9e26b74476fe4da0f7dee2335',
   '0bb4127d89d9073ea425c303adc3f9db39e40adac23ea61fba8b6e251d79390f',
   '109ebb4cb2ad746762b6652fc63b99019857ae89acfe9807648c3cfa151fed42',
   'b53db6bf0c8317586ae6c1a1e2857f241bf55dddd1b423578c6949d4bf014611',
   '4a34bd4dfeef7fa1dc739280f16a3fe1281a51311c10a920ab43d406d4ae3370',
   '4de7bab7fe9a0a9bf7b51a7cdf7d929f2b1c6ff4575fd527baba1efdf4254890',
   '4f1ee7cb36c58803a8721d4ac8c4cf8cae5d8832392eed2a96dc59694252801b',
 ];