[es6] Remove harmony-object-literal flag

test/mjsunit/harmony/object-literals-property-shorthand.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-object-literals
-
-
-(function TestBasics() {
-  var x = 1;
-  var object = {x};
-  assertEquals(1, object.x);
-})();
-
-
-(function TestDescriptor() {
-  var x = 1;
-  var object = {x};
-  var descr = Object.getOwnPropertyDescriptor(object, 'x');
-  assertEquals(1, descr.value);
-  assertTrue(descr.enumerable);
-  assertTrue(descr.writable);
-  assertTrue(descr.configurable);
-})();
-
-
-(function TestNotDefined() {
-  'use strict';
-  assertThrows(function() {
-    return {notDefined};
-  }, ReferenceError);
-})();
-
-
-(function TestLet() {
-  var let = 1;
-  var object = {let};
-  assertEquals(1, object.let);
-})();
-
-
-(function TestYieldInFunction() {
-  var yield = 1;
-  var object = {yield};
-  assertEquals(1, object.yield);
-})();
-
-
-(function TestToString() {
-  function f(x) { return {x}; }
-  assertEquals('function f(x) { return {x}; }', f.toString());
-})();
-
-
-(function TestProtoName() {
-  var __proto__ = 1;
-  var object = {
-    __proto__
-  };
-  assertEquals(Object.prototype, Object.getPrototypeOf(object));
-  assertEquals(1, object.__proto__);
-})();
-
-
-(function TestProtoName2() {
-  var __proto__ = 1;
-  var p = {};
-  var object = {
-    __proto__: p,
-    __proto__,
-  };
-  assertEquals(p, Object.getPrototypeOf(object));
-  assertEquals(1, object.__proto__);
-})();