Make dart:convert strong mode clean.

pkg/analysis_server/benchmark/integration/input_converter.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 input.transformer;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
@@ skipping 253 matching lines @@
     }
     return json;
   }
 }
 
 /**
  * [InputConverter] converts an input stream
  * into a series of operations to be sent to the analysis server.
  * The input stream can be either an instrumenation or log file.
  */
-class InputConverter
-    extends ChunkedConverter<String, Operation, String, Operation> {
+class InputConverter extends Converter<String, Operation> {
 
   final Logger logger = new Logger('InputConverter');
 
   /**
    * A mapping of source path prefixes
    * from location where instrumentation or log file was generated
    * to the target location of the source using during performance measurement.
    */
   final PathMap srcPathMap;
 
@@ skipping 106 matching lines @@
     if (op != null) {
       outSink.add(op);
     }
   }
 
   @override
   void close() {
     outSink.close();
   }
 }