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

tests/language/index_test.dart

Index: tests/language/index_test.dart
diff --git a/tests/language/index_test.dart b/tests/language/index_test.dart
index 3462e4e8e336e92cdd87909b93f14e67a110ddf6..9e1c634621af55cdf456eac7954f115d741c5964 100644
--- a/tests/language/index_test.dart
+++ b/tests/language/index_test.dart
@@ -18,7 +18,7 @@ class IndexTest {
   static const ID_IDLE = 0;
 
   static testMain() {
-    var a = new List.fixedLength(10);
+    var a = new List(10);
     Expect.equals(10, a.length);
     for (int i = 0; i < a.length; i++) {
       a[i] = Helper.fibonacci(i);