Update deprecations.

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.
 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]);
+        expectHmacEquals(sha256, _inputs[i], _keys[i], _macs[i]);
       });
     }
   });
 }
 
 // Standard test vectors from:
 //   http://csrc.nist.gov/groups/STM/cavp/documents/mac/hmactestvectors.zip
 
 const _inputs = const [
   const [ 0x75, 0x2c, 0xff, 0x52, 0xe4, 0xb9, 0x07, 0x68, 0x55, 0x8e, 0x53, 0x69, 0xe7, 0x5d, 0x97, 0xc6, 0x96, 0x43, 0x50, 0x9a, 0x5e, 0x59, 0x04, 0xe0, 0xa3, 0x86, 0xcb, 0xe4, 0xd0, 0x97, 0x0e, 0xf7, 0x3f, 0x91, 0x8f, 0x67, 0x59, 0x45, 0xa9, 0xae, 0xfe, 0x26, 0xda, 0xea, 0x27, 0x58, 0x7e, 0x8d, 0xc9, 0x09, 0xdd, 0x56, 0xfd, 0x04, 0x68, 0x80, 0x5f, 0x83, 0x40, 0x39, 0xb3, 0x45, 0xf8, 0x55, 0xcf, 0xe1, 0x9c, 0x44, 0xb5, 0x5a, 0xf2, 0x41, 0xff, 0xf3, 0xff, 0xcd, 0x80, 0x45, 0xcd, 0x5c, 0x28, 0x8e, 0x6c, 0x4e, 0x28, 0x4c, 0x37, 0x20, 0x57, 0x0b, 0x58, 0xe4, 0xd4, 0x7b, 0x8f, 0xee, 0xed, 0xc5, 0x2f, 0xd1, 0x40, 0x1f, 0x69, 0x8a, 0x20, 0x9f, 0xcc, 0xfa, 0x3b, 0x4c, 0x0d, 0x9a, 0x79, 0x7b, 0x04, 0x6a, 0x27, 0x59, 0xf8, 0x2a, 0x54, 0xc4, 0x1c, 0xcd, 0x7b, 0x5f, 0x59, 0x2b ],
@@ skipping 671 matching lines @@
   '988d4a6fa87f8138d754c5de9d176c45eaccf8eb8ca1799d87c8f04a966b6f4c',
   'ee6492a669e22bcf19bbdfc45495cd0efa9c2f2ef5d42831e3f13a545cbcd6a1',
   '9611e838fb1d816a0ff9cd269217d93258c34df9e26b74476fe4da0f7dee2335',
   '0bb4127d89d9073ea425c303adc3f9db39e40adac23ea61fba8b6e251d79390f',
   '109ebb4cb2ad746762b6652fc63b99019857ae89acfe9807648c3cfa151fed42',
   'b53db6bf0c8317586ae6c1a1e2857f241bf55dddd1b423578c6949d4bf014611',
   '4a34bd4dfeef7fa1dc739280f16a3fe1281a51311c10a920ab43d406d4ae3370',
   '4de7bab7fe9a0a9bf7b51a7cdf7d929f2b1c6ff4575fd527baba1efdf4254890',
   '4f1ee7cb36c58803a8721d4ac8c4cf8cae5d8832392eed2a96dc59694252801b',
 ];