Introduce class Sink<T>.

sdk/lib/convert/utf.dart

 // Copyright (c) 2013, 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.
 
 part of dart.convert;
 
 /** The Unicode Replacement character `U+FFFD` (�). */
 const int UNICODE_REPLACEMENT_CHARACTER_RUNE = 0xFFFD;
 
 /** The Unicode Byte Order Marker (BOM) character `U+FEFF`. */
@@ skipping 89 matching lines @@
     }
     return encoder._buffer.sublist(0, encoder._bufferIndex);
   }
 
   /**
    * Starts a chunked conversion.
    *
    * The converter works more efficiently if the given [sink] is a
    * [ByteConversionSink].
    */
-  StringConversionSink startChunkedConversion(
-      ChunkedConversionSink<List<int>> sink) {
+  StringConversionSink startChunkedConversion(Sink<List<int>> sink) {
     if (sink is! ByteConversionSink) {
       sink = new ByteConversionSink.from(sink);
     }
     return new _Utf8EncoderSink(sink);
   }
 
   // Override the base-classes bind, to provide a better type.
   Stream<List<int>> bind(Stream<String> stream) => super.bind(stream);
 }
 
@@ skipping 203 matching lines @@
     decoder.close();
     return buffer.toString();
   }
 
   /**
    * Starts a chunked conversion.
    *
    * The converter works more efficiently if the given [sink] is a
    * [StringConversionSink].
    */
-  ByteConversionSink startChunkedConversion(
-      ChunkedConversionSink<String> sink) {
+  ByteConversionSink startChunkedConversion(Sink<String> sink) {
     StringConversionSink stringSink;
     if (sink is StringConversionSink) {
       stringSink = sink;
     } else {
       stringSink = new StringConversionSink.from(sink);
     }
     return stringSink.asUtf8Sink(_allowMalformed);
   }
 
   // Override the base-classes bind, to provide a better type.
@@ skipping 171 matching lines @@
       }
       break loop;
     }
     if (expectedUnits > 0) {
       _value = value;
       _expectedUnits = expectedUnits;
       _extraUnits = extraUnits;
     }
   }
 }