Make JSON parsing work as a chunked conversion sink.

tests/lib/convert/unicode_tests.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.
 
 library unicode_tests;
 
 // Google favorite: "Îñţérñåţîöñåļîžåţîờñ".
 const INTER_BYTES = const [0xc3, 0x8e, 0xc3, 0xb1, 0xc5, 0xa3, 0xc3, 0xa9, 0x72,
                            0xc3, 0xb1, 0xc3, 0xa5, 0xc5, 0xa3, 0xc3, 0xae, 0xc3,
                            0xb6, 0xc3, 0xb1, 0xc3, 0xa5, 0xc4, 0xbc, 0xc3, 0xae,
@@ skipping 70 matching lines @@
     const [ SMALLEST_3_UTF8_UNIT_BYTES, SMALLEST_3_UTF8_UNIT_STRING ],
     const [ BIGGEST_3_UTF8_UNIT_BYTES, BIGGEST_3_UTF8_UNIT_STRING ],
     const [ SMALLEST_4_UTF8_UNIT_BYTES, SMALLEST_4_UTF8_UNIT_STRING ],
     const [ BIGGEST_4_UTF8_UNIT_BYTES, BIGGEST_4_UTF8_UNIT_STRING ],
     ];
 
 List<List> _expandTestPairs() {
   assert(2 == BEE_STRING.length);
   var tests = [];
   tests.addAll(_TEST_PAIRS);
-  tests.addAll(_TEST_PAIRS.expand((test) {
+  tests.addAll(_TEST_PAIRS.map((test) {
     var bytes = test[0];
     var string = test[1];
     var longBytes = [];
     var longString = "";
     for (int i = 0; i < 100; i++) {
       longBytes.addAll(bytes);
       longString += string;
     }
-    return [test, [longBytes, longString]];
+    return [longBytes, longString];
   }));
   return tests;
 }
 
 final List UNICODE_TESTS = _expandTestPairs();