Remove insertRange.

samples/sample_extension/test_sample_asynchronous_extension.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.
 
 library test_sample_extension;
 
 import 'sample_asynchronous_extension.dart';
 
 // TODO(3008): Run this test automatically on buildbot (dart:3008).
 void main() {
   RandomArray r = new RandomArray();
   r.randomArray(100, 17, (list_100) {
     r.randomArray(200, 17, (list_200) {
       for (var i = 0; i < 100; ++i) {
         Expect.equals(list_100[i], list_200[i]);
       }
     });
   });
 
   // Gets a list of 256000 random uint8 values, using seed 19, and
   // runs checkNormal on that list.
   r.randomArray(256000, 19, checkNormal);
 }
 
 void checkNormal(List l) {
   // Count how many times each byte value occurs.  Assert that the counts
   // are all withing a reasonable (six-sigma) range.
-  List counts = new List<int>();
-  counts.insertRange(0, 256, 0);
+  List counts = new List<int>.filled(256, 0);
   for (var e in l) { counts[e]++; }
   new RandomArray().randomArray(256000, 18, checkCorrelation(counts));
 }
 
 void checkCorrelation(List counts) {
   return (List l) {
-    List counts_2 = new List<int>();
-    counts_2.insertRange(0, 256, 0);
+    List counts_2 = new List<int>.filled(256, 0);
     for (var e in l) { counts_2[e]++; }
     var product = 0;
     for (var i = 0; i < 256; ++i) {
       Expect.isTrue(counts[i] < 1200);
       Expect.isTrue(counts_2[i] < 1200);
       Expect.isTrue(counts[i] > 800);
       Expect.isTrue(counts[i] > 800);
 
       product += counts[i] * counts_2[i];
     }
     Expect.isTrue(product < 256000000 * 1.001);
     Expect.isTrue(product > 256000000 * 0.999);
   };
 }