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

tests/lib/crypto/sha1_test.dart

Index: tests/lib/crypto/sha1_test.dart
diff --git a/tests/lib/crypto/sha1_test.dart b/tests/lib/crypto/sha1_test.dart
index b9e90697c15c2d01307038f07101bce316b0c529..d977230e9ff19c823fa1933f83d26e35749bc866 100644
--- a/tests/lib/crypto/sha1_test.dart
+++ b/tests/lib/crypto/sha1_test.dart
@@ -11,7 +11,7 @@ part 'sha1_long_test_vectors.dart';
 part 'sha1_short_test_vectors.dart';
 
 List<int> createTestArr(int len) {
-  var arr = new List<int>.fixedLength(len);
+  var arr = new List<int>(len);
   for (var i = 0; i < len; i++) {
     arr[i] = i;
   }