Update deprecations.

test/hmac_md5_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.
 
 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 MD5(), _inputs[i], _keys[i], _macs[i]);
+        expectHmacEquals(md5, _inputs[i], _keys[i], _macs[i]);
       });
     }
   });
 }
 
 // Data from http://tools.ietf.org/html/rfc2202.
 const _inputs = const [
   const [ 0x48, 0x69, 0x20, 0x54, 0x68, 0x65, 0x72, 0x65 ],
   const [ 0x77, 0x68, 0x61, 0x74, 0x20, 0x64, 0x6f, 0x20, 0x79, 0x61, 0x20, 0x77, 0x61, 0x6e, 0x74, 0x20, 0x66, 0x6f, 0x72, 0x20, 0x6e, 0x6f, 0x74, 0x68, 0x69, 0x6e, 0x67, 0x3f ],
   const [ 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd ],
@@ skipping 15 matching lines @@
 
 const _macs = const [
   '9294727a3638bb1c13f48ef8158bfc9d',
   '750c783e6ab0b503eaa86e310a5db738',
   '56be34521d144c88dbb8c733f0e8b3f6',
   '697eaf0aca3a3aea3a75164746ffaa79',
   '56461ef2342edc00f9bab995690efd4c',
   '6b1ab7fe4bd7bf8f0b62e6ce61b9d0cd',
   '6f630fad67cda0ee1fb1f562db3aa53e'
 ];