Remove --harmony-scoping flag.

test/mjsunit/regress/regress-2506.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-scoping
-
-'use strict';
-
-// Top-level code
-let s = 0;
-let f = [undefined, undefined, undefined]
-for (const x of [1,2,3]) {
-  s += x;
-  f[x-1] = function() { return x; }
-}
-assertEquals(6, s);
-assertEquals(1, f[0]());
-assertEquals(2, f[1]());
-assertEquals(3, f[2]());
-
-let x = 1;
-s = 0;
-for (const x of [x, x+1, x+2]) {
-  s += x;
-}
-assertEquals(6, s);
-
-s = 0;
-var q = 1;
-for (const q of [q, q+1, q+2]) {
-  s += q;
-}
-assertEquals(6, s);
-
-let z = 1;
-s = 0;
-for (const x = 1; z < 2; z++) {
-  s += x + z;
-}
-assertEquals(2, s);
-
-
-s = "";
-for (const x in [1,2,3]) {
-  s += x;
-}
-assertEquals("012", s);
-
-assertThrows("'use strict'; for (const x in [1,2,3]) { x++ }", TypeError);
-
-// Function scope
-(function() {
-  let s = 0;
-  for (const x of [1,2,3]) {
-    s += x;
-  }
-  assertEquals(6, s);
-
-  let x = 1;
-  s = 0;
-  for (const x of [x, x+1, x+2]) {
-    s += x;
-  }
-  assertEquals(6, s);
-
-  s = 0;
-  var q = 1;
-  for (const q of [q, q+1, q+2]) {
-    s += q;
-  }
-  assertEquals(6, s);
-
-  s = "";
-  for (const x in [1,2,3]) {
-    s += x;
-  }
-  assertEquals("012", s);
-}());