Remove FLAG_min_preparse_length.

test/mjsunit/es6/arrow-rest-params-lazy-parsing.js

Index: test/mjsunit/es6/arrow-rest-params-lazy-parsing.js
diff --git a/test/mjsunit/es6/arrow-rest-params-lazy-parsing.js b/test/mjsunit/es6/arrow-rest-params-lazy-parsing.js
index 05e92b6ed65a981db426c73d5e040296562b0cc1..2844069d17d4fd32776f0554dc41886d78914e62 100644
--- a/test/mjsunit/es6/arrow-rest-params-lazy-parsing.js
+++ b/test/mjsunit/es6/arrow-rest-params-lazy-parsing.js
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --min-preparse-length=0
-
 (function testRestIndex() {
   assertEquals(5, ((...args) => args.length)(1,2,3,4,5));
   assertEquals(4, ((a, ...args) => args.length)(1,2,3,4,5));