Remove always-true --harmony-restrictive-declarations flag

test/mjsunit/regress/regress-542100.js

-// Copyright 2015 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: --no-harmony-restrictive-declarations
-
-(function() {
-  var x = {a: 1}
-  assertEquals("undefined", typeof f);
-  with (x)
-    function f() { return a; }
-  assertEquals("function", typeof f);
-  assertEquals(1, f());
-  x.a = 2;
-  assertEquals(2, f());
-})();
-
-var y = {b: 1}
-assertEquals("undefined", typeof g);
-with (y)
-  function g() { return b; }
-assertEquals("function", typeof g);
-assertEquals(1, g());
-y.b = 2;
-assertEquals(2, g());