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

tests/corelib/set_test.dart

 // Copyright (c) 2011, 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.
 
 class SetTest {
 
   static testMain() {
     Set set = new Set();
     Expect.equals(0, set.length);
     set.add(1);
@@ skipping 120 matching lines @@
     Expect.equals(false, intersection.contains(9));
     Expect.equals(false, intersection.contains(10));
     Expect.equals(4, intersection.length);
 
     Expect.equals(true, set.containsAll(intersection));
     Expect.equals(true, filtered.containsAll(intersection));
     Expect.equals(true, intersection.isSubsetOf(set));
     Expect.equals(true, intersection.isSubsetOf(filtered));
 
     // Test Set.addAll.
-    List list = new List.fixedLength(10);
+    List list = new List(10);
     for (int i = 0; i < 10; i++) {
       list[i] = i + 10;
     }
     set.addAll(list);
     Expect.equals(20, set.length);
     for (int i = 0; i < 20; i++) {
       Expect.equals(true, set.contains(i));
     }
 
     // Test Set.removeAll
@@ skipping 10 matching lines @@
     set.clear();
     Expect.equals(0, set.length);
     set.add(11);
     Expect.equals(1, set.length);
   }
 }
 
 main() {
   SetTest.testMain();
 }