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

tests/corelib/for_in_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 ForInTest {
   static testMain() {
     testSimple();
     testBreak();
     testContinue();
     testClosure();
@@ skipping 61 matching lines @@
     int count = 0;
     for (final i in set) {
       if (i < 4) continue;
       count += i;
     }
     Expect.equals(4, count);
   }
 
   static void testClosure() {
     Set<int> set = getSmallSet();
-    List<Function> closures = new List.fixedLength(set.length);
+    List<Function> closures = new List(set.length);
     int index = 0;
     for (var i in set) {
       closures[index++] = () => i;
     }
 
     Expect.equals(index, set.length);
     Expect.equals(7, closures[0]() + closures[1]() + closures[2]());
   }
 }
 
 main() {
   ForInTest.testMain();
 }