Remove deprecated APIs.

lib/src/sha256.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 'dart:convert';
 import 'dart:typed_data';
 
 import 'digest.dart';
 import 'hash.dart';
 import 'hash_sink.dart';
@@ skipping 16 matching lines @@
   final int blockSize = 16 * bytesPerWord;
 
   Sha256._();
 
   Sha256 newInstance() => new Sha256._();
 
   ByteConversionSink startChunkedConversion(Sink<Digest> sink) =>
       new ByteConversionSink.from(new _Sha256Sink(sink));
 }
 
-/// This class is deprecated.
-///
-/// Use [sha256] instead.
-@Deprecated("Will be removed in crypto 1.0.0.")
-class SHA256 extends Sha256 {
-  SHA256() : super._();
-
-  SHA256 newInstance() => new SHA256();
-}
-
 /// Data from a non-linear function that functions as reproducible noise.
 const List<int> _noise = const [
   0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1,
   0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
   0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786,
   0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
   0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
   0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
   0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
   0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
@@ skipping 85 matching lines @@
     digest[0] = add32(a, digest[0]);
     digest[1] = add32(b, digest[1]);
     digest[2] = add32(c, digest[2]);
     digest[3] = add32(d, digest[3]);
     digest[4] = add32(e, digest[4]);
     digest[5] = add32(f, digest[5]);
     digest[6] = add32(g, digest[6]);
     digest[7] = add32(h, digest[7]);
   }
 }