Stop implementing ChunkedConverter.

lib/src/hex/decoder.dart

 // Copyright (c) 2015, 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 convert.hex.decoder;
 
 import 'dart:convert';
 import 'dart:typed_data';
 
 import '../utils.dart';
 
 /// The canonical instance of [HexDecoder].
 const hexDecoder = const HexDecoder._();
 
 /// A converter that decodes hexadecimal strings into byte arrays.
 ///
 /// Because two hexadecimal digits correspond to a single byte, this will throw
 /// a [FormatException] if given an odd-length string. It will also throw a
 /// [FormatException] if given a string containing non-hexadecimal code units.
-class HexDecoder
-    extends ChunkedConverter<String, List<int>, String, List<int>> {
+class HexDecoder extends Converter<String, List<int>> {
   const HexDecoder._();
 
   List<int> convert(String string) {
     if (!string.length.isEven) {
       throw new FormatException("Invalid input length, must be even.",
           string, string.length);
     }
 
     var bytes = new Uint8List(string.length ~/ 2);
     _decode(string.codeUnits, 0, string.length, bytes, 0);
@@ skipping 132 matching lines @@
   var destinationIndex = destinationStart;
   for (var i = sourceStart; i < sourceEnd - 1; i += 2) {
     var firstDigit = digitForCodeUnit(codeUnits, i);
     var secondDigit = digitForCodeUnit(codeUnits, i + 1);
     destination[destinationIndex++] = 16 * firstDigit + secondDigit;
   }
 
   if ((sourceEnd - sourceStart).isEven) return null;
   return 16 * digitForCodeUnit(codeUnits, sourceEnd - 1);
 }