Upgrade V8 to 5.1.281.57

Change-Id: Id981b686b4d587ac31697662eb98bb34be42ad90
diff --git a/test/message/let-lexical-name-in-array-prohibited.js b/test/message/let-lexical-name-in-array-prohibited.js
index c7a35cd..a6cba6f 100644
--- a/test/message/let-lexical-name-in-array-prohibited.js
+++ b/test/message/let-lexical-name-in-array-prohibited.js
@@ -2,6 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
-// Flags: --harmony-sloppy --harmony-sloppy-let --harmony-destructuring-bind
+// Flags: --harmony-sloppy --harmony-sloppy-let
 
 let [let];