Remove --harmony-arrow-functions flag

test/mjsunit/harmony/regress/regress-3501.js

Index: test/mjsunit/harmony/regress/regress-3501.js
diff --git a/test/mjsunit/harmony/regress/regress-3501.js b/test/mjsunit/harmony/regress/regress-3501.js
deleted file mode 100644
index 4b449e458f545b5758a8a3ca579be1913becc29a..0000000000000000000000000000000000000000
--- a/test/mjsunit/harmony/regress/regress-3501.js
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright 2014 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Flags: --harmony-arrow-functions
-
-// See: http://code.google.com/p/v8/issues/detail?id=3501
-
-"use strict";
-let lift = f => (x, k) => k (f (x));
-lift(isNaN);