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

tests/language/instanceof2_test.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.
 // Dart test program for testing the instanceof operation.
 
 abstract class I { }
 
 abstract class AI implements I { }
 
 class A implements AI {
@@ skipping 36 matching lines @@
     Expect.equals(false, c is B);
     Expect.equals(false, n is A);
 
     Expect.equals(false, null is A);
     Expect.equals(false, null is B);
     Expect.equals(false, null is C);
     Expect.equals(false, null is AI);
     Expect.equals(false, null is I);
 
     {
-      var a = new List.fixedLength(5);
+      var a = new List(5);
       Expect.equals(true, a is List);
       Expect.equals(true, a is List<Object>);
       Expect.equals(true, a is List<int>);
       Expect.equals(true, a is List<num>);
       Expect.equals(true, a is List<String>);
     }
     {
-      var a = new List<Object>.fixedLength(5);
+      var a = new List<Object>(5);
       Expect.equals(true, a is List);
       Expect.equals(true, a is List<Object>);
       Expect.equals(false, a is List<int>);
       Expect.equals(false, a is List<num>);
       Expect.equals(false, a is List<String>);
     }
     {
-      var a = new List<int>.fixedLength(5);
+      var a = new List<int>(5);
       Expect.equals(true, a is List);
       Expect.equals(true, a is List<Object>);
       Expect.equals(true, a is List<int>);
       Expect.equals(true, a is List<num>);
       Expect.equals(false, a is List<String>);
     }
     {
-      var a = new List<num>.fixedLength(5);
+      var a = new List<num>(5);
       Expect.equals(true, a is List);
       Expect.equals(true, a is List<Object>);
       Expect.equals(false, a is List<int>);
       Expect.equals(true, a is List<num>);
       Expect.equals(false, a is List<String>);
     }
     {
-      var a = new List<String>.fixedLength(5);
+      var a = new List<String>(5);
       Expect.equals(true, a is List);
       Expect.equals(true, a is List<Object>);
       Expect.equals(false, a is List<int>);
       Expect.equals(false, a is List<num>);
       Expect.equals(true, a is List<String>);
     }
   }
 }
 
 main() {
   // Repeat type checks so that inlined tests can be tested as well.
   for (int i = 0; i < 5; i++) {
     InstanceofTest.testMain();
   }
 }