Introduce class Sink<T>.

sdk/lib/convert/line_splitter.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;
 
 /**
  * This class splits [String] values into individual lines.
  */
 class LineSplitter extends Converter<String, List<String>> {
 
   const LineSplitter();
 
   List<String> convert(String data) {
     var lines = new List<String>();
 
     _LineSplitterSink._addSlice(data, 0, data.length, true, lines.add);
 
     return lines;
   }
 
-  StringConversionSink startChunkedConversion(
-    ChunkedConversionSink<String> sink) {
-
+  StringConversionSink startChunkedConversion(Sink<String> sink) {
     if (sink is! StringConversionSink) {
       sink = new StringConversionSink.from(sink);
     }
     return new _LineSplitterSink(sink);
   }
 }
 
 // TODO(floitsch): deal with utf8.
 class _LineSplitterSink extends StringConversionSinkBase {
   static const int _LF = 10;
@@ skipping 51 matching lines @@
       if (isLast) {
         // Add remaining
         adder(carry);
       } else {
         return carry;
       }
     }
     return null;
   }
 }