Remove --harmony-array-includes flag

test/mjsunit/es7/array-includes-to-object-strict.js

 // 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-array-includes
-
 // Ported from
 // https://github.com/tc39/Array.prototype.includes/blob/master/test/number-this.js
 // using https://www.npmjs.org/package/test262-to-mjsunit
 
 // Array.prototype.includes should use ToObject on this, so that when called
 // with a number, it picks up numeric properties from Number.prototype (even in
 // strict mode)
 (function() {
   "use strict";
 
   Number.prototype[0] = "a";
   Number.prototype[1] = "b";
 
   Object.defineProperty(Number.prototype, 2, {
     get: function() {
       assertEquals("object", typeof this);
       return "c";
     }
   });
 
   Number.prototype.length = 3;
   assertTrue(Array.prototype.includes.call(5, "a"));
   assertTrue(Array.prototype.includes.call(5, "b"));
   assertTrue(Array.prototype.includes.call(5, "c"));
   assertFalse(Array.prototype.includes.call(5, "d"));
 })();