Introduce class Sink<T>.

sdk/lib/convert/latin1.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;
 
 /**
  * An instance of the default implementation of the [Latin1Codec].
  *
  * This instance provides a convenient access to the most common ISO Latin 1
@@ skipping 79 matching lines @@
    */
   const Latin1Decoder({ bool allowInvalid: false })
       : super(allowInvalid, _LATIN1_MASK);
 
   /**
    * 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);
     }
     // TODO(lrn): Use stringSink.asUtf16Sink() if it becomes available.
     return new _Latin1DecoderSink(_allowInvalid, stringSink);
   }
 }
@@ skipping 39 matching lines @@
         }
       }
     }
     if (start < end) {
       _addSliceToSink(source, start, end, isLast);
     } else if (isLast) {
       close();
     }
   }
 }