Change List constructors.

tests/lib/async/slow_sink_test.dart

 // Copyright (c) 2012, 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.
 
 // VMOptions=--old_gen_heap_size=32
 
 import 'dart:async';
 
 const int KB = 1024;
 const int MB = KB * KB;
@@ skipping 24 matching lines @@
   var current = new Future.immediate(0);
   final int bytesPerSecond;
 }
 
 class DataProvider extends StreamController {
   DataProvider(int bytesPerSecond, int runtime) {
     const int ms = 5;
     bool run = true;
     send() {
       if (!run) return;
-      var wait = add(new List(bytesPerSecond * ms ~/ 1000));
+      var wait = add(new List.fixedLength(bytesPerSecond * ms ~/ 1000));
       if (wait != null) {
         wait.then(() {
           new Timer(ms, (_) => send());
         });
       } else {
         new Timer(ms, (_) => send());
       }
     }
     new Timer(ms, (_) => send());
     new Timer(runtime, (_) {
       run = false;
     });
   }
 }
 
 main() {
   // 0.5 s * 200 MB/s = 100 MB.
   new DataProvider(400 * MB, 200).pipe(new SlowSink(100 * MB));
 }