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

tests/corelib/for_in_test.dart

Index: tests/corelib/for_in_test.dart
diff --git a/tests/corelib/for_in_test.dart b/tests/corelib/for_in_test.dart
index de51cc159baea2015ae30e786b8a7e18920add2e..ea537273bc0bec5d191b98c1944d17e401595878 100644
--- a/tests/corelib/for_in_test.dart
+++ b/tests/corelib/for_in_test.dart
@@ -79,7 +79,7 @@ class ForInTest {
 
   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;