Rename and move ExperimentalMacRTL flag

chrome/browser/ui/cocoa/test/scoped_force_rtl_mac.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/cocoa/test/scoped_force_rtl_mac.h"
 
 #import <Foundation/Foundation.h>
 
 #include "base/i18n/rtl.h"
-#include "chrome/browser/ui/cocoa/l10n_util.h"
+#include "chrome/common/chrome_features.h"
 
 namespace {
 
 NSString* const kAppleTextDirectionDefaultsKey = @"AppleTextDirection";
 NSString* const kForceRTLWritingDirectionDefaultsKey =
     @"NSForceRightToLeftWritingDirection";
 const char kDefaultRTLLocale[] = "he";  // Hebrew.
 
 }  // namespace
 
 namespace cocoa_l10n_util {
 
 ScopedForceRTLMac::ScopedForceRTLMac() {
-  scoped_feature_list_.InitAndEnableFeature(kExperimentalMacRTL);
+  scoped_feature_list_.InitAndEnableFeature(features::kMacRTL);
   NSUserDefaults* standard_defaults = [NSUserDefaults standardUserDefaults];
   original_apple_text_direction_ =
       [standard_defaults boolForKey:kAppleTextDirectionDefaultsKey];
   original_rtl_writing_direction_ =
       [standard_defaults boolForKey:kForceRTLWritingDirectionDefaultsKey];
   [standard_defaults setBool:YES forKey:kAppleTextDirectionDefaultsKey];
   [standard_defaults setBool:YES forKey:kForceRTLWritingDirectionDefaultsKey];
   original_locale_ = base::i18n::GetConfiguredLocale();
   base::i18n::SetICUDefaultLocale(kDefaultRTLLocale);
 }
 
 ScopedForceRTLMac::~ScopedForceRTLMac() {
   [[NSUserDefaults standardUserDefaults]
       setBool:original_apple_text_direction_
        forKey:kAppleTextDirectionDefaultsKey];
   [[NSUserDefaults standardUserDefaults]
       setBool:original_rtl_writing_direction_
        forKey:kForceRTLWritingDirectionDefaultsKey];
   base::i18n::SetICUDefaultLocale(original_locale_);
 }
 
 }  // namespace cocoa_l10n_util