Remove deprecated APIs.

lib/src/base64/encoder_sink.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.
-
-import 'dart:convert';
-
-import 'encoder.dart';
-
-/// This is deprecated.
-///
-/// Use the `Base64Encoder` class in `dart:convert` instead.
-@Deprecated("Will be removed in crypto 1.0.0.")
-class Base64EncoderSink extends ChunkedConversionSink<List<int>> {
-  /// The encoder used to encode each chunk.
-  final Base64Encoder _encoder;
-
-  /// The underlying sink to which to emit the encoded strings.
-  final ChunkedConversionSink<String> _outSink;
-
-  /// The buffer of as-yet-unconverted bytes.
-  ///
-  /// This is used to ensure that we don't generate interstitial padding
-  /// characters.
-  final _buffer = new List<int>();
-
-  /// The length of [_buffer]; that is, the number of unconverted bytes.
-  var _bufferCount = 0;
-
-  Base64EncoderSink(this._outSink, urlSafe, addLineSeparator)
-      : _encoder = new Base64Encoder(
-            urlSafe: urlSafe, addLineSeparator: addLineSeparator);
-
-  void add(List<int> chunk) {
-    var nextBufferCount = (chunk.length + _bufferCount) % 3;
-    var decodableLength = _bufferCount + chunk.length - nextBufferCount;
-
-    if (_bufferCount + chunk.length > _buffer.length) {
-      _buffer.replaceRange(_bufferCount, _buffer.length,
-          chunk.sublist(0, _buffer.length - _bufferCount));
-      _buffer.addAll(chunk.sublist(_buffer.length - _bufferCount));
-    } else {
-      _buffer.replaceRange(_bufferCount, _bufferCount + chunk.length, chunk);
-    }
-
-    _outSink.add(_encoder.convert(_buffer, 0, decodableLength));
-    _buffer.removeRange(0, decodableLength);
-    _bufferCount = nextBufferCount;
-  }
-
-  void close() {
-    if (_bufferCount > 0) {
-      _outSink.add(_encoder.convert(_buffer.sublist(0, _bufferCount)));
-    }
-    _outSink.close();
-  }
-}
-