Remove --harmony-regexps flag

src/js/harmony-regexp.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.
-
-(function(global, utils) {
-
-'use strict';
-
-%CheckIsBootstrapping();
-
-// -------------------------------------------------------------------
-// Imports
-
-var GlobalRegExp = global.RegExp;
-var GlobalRegExpPrototype = GlobalRegExp.prototype;
-var MakeTypeError;
-var regExpFlagsSymbol = utils.ImportNow("regexp_flags_symbol");
-
-utils.Import(function(from) {
-  MakeTypeError = from.MakeTypeError;
-});
-
-// -------------------------------------------------------------------
-
-// ES6 draft 12-06-13, section 21.2.5.3
-// + https://bugs.ecmascript.org/show_bug.cgi?id=3423
-function RegExpGetFlags() {
-  if (!IS_RECEIVER(this)) {
-    throw MakeTypeError(
-        kRegExpNonObject, "RegExp.prototype.flags", TO_STRING(this));
-  }
-  var result = '';
-  if (this.global) result += 'g';
-  if (this.ignoreCase) result += 'i';
-  if (this.multiline) result += 'm';
-  if (this.unicode) result += 'u';
-  if (this.sticky) result += 'y';
-  return result;
-}
-
-// ES6 21.2.5.12.
-function RegExpGetSticky() {
-  if (!IS_REGEXP(this)) {
-    // Compat fix: RegExp.prototype.sticky == undefined; UseCounter tracks it
-    // TODO(littledan): Remove this workaround or standardize it
-    if (this === GlobalRegExpPrototype) {
-      %IncrementUseCounter(kRegExpPrototypeStickyGetter);
-      return UNDEFINED;
-    }
-    throw MakeTypeError(kRegExpNonRegExp, "RegExp.prototype.sticky");
-  }
-  return !!REGEXP_STICKY(this);
-}
-%FunctionSetName(RegExpGetSticky, "RegExp.prototype.sticky");
-%SetNativeFlag(RegExpGetSticky);
-
-utils.InstallGetter(GlobalRegExp.prototype, 'flags', RegExpGetFlags);
-utils.InstallGetter(GlobalRegExp.prototype, 'sticky', RegExpGetSticky);
-
-})