Change new List(n) to return fixed length list.

tests/standalone/io/http_head_test.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.
 
 import "dart:io";
 
 void testHEAD(int totalConnections) {
   HttpServer.bind().then((server) {
     server.listen((request) {
         var response = request.response;
         if (request.uri.path == "/test100") {
           response.contentLength = 100;
           response.close();
         } else if (request.uri.path == "/test200") {
           response.contentLength = 200;
-          List<int> data = new List<int>.fixedLength(200, fill: 0);
+          List<int> data = new List<int>.filled(200, 0);
           response.add(data);
           response.close();
         } else {
           assert(false);
         }
       });
 
     HttpClient client = new HttpClient();
 
     int count = 0;
@@ skipping 13 matching lines @@
               }
             });
         });
     }
   });
 }
 
 void main() {
   testHEAD(4);
 }