Add ScopedMacRTL class for Cocoa browser RTL testing

chrome/browser/ui/cocoa/l10n_util.mm

 // Copyright (c) 2010 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.
 
 #import "chrome/browser/ui/cocoa/l10n_util.h"
 
-#include "base/i18n/rtl.h"
-#include "base/mac/mac_util.h"
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #import "third_party/google_toolbox_for_mac/src/AppKit/GTMUILocalizerAndLayoutTweaker.h"
 
 namespace cocoa_l10n_util {
 
 NSInteger CompareFrameY(id view1, id view2, void* context) {
   CGFloat y1 = NSMinY([view1 frame]);
   CGFloat y2 = NSMinY([view2 frame]);
   if (y1 < y2)
@@ skipping 58 matching lines @@
 
 NSString* TooltipForURLAndTitle(NSString* url, NSString* title) {
   if ([title length] == 0)
     return url;
   else if ([url length] == 0 || [url isEqualToString:title])
     return title;
   else
     return [NSString stringWithFormat:@"%@\n%@", title, url];
 }
 
-const base::Feature kExperimentalMacRTL{"ExperimentalMacRTL",
-                                        base::FEATURE_DISABLED_BY_DEFAULT};
-
-bool ShouldDoExperimentalRTLLayout() {
-  return base::i18n::IsRTL() &&
-         base::FeatureList::IsEnabled(kExperimentalMacRTL);
-}
-
-bool ShouldFlipWindowControlsInRTL() {
-  return ShouldDoExperimentalRTLLayout() && base::mac::IsAtLeastOS10_12();
-}
-
 }  // namespace cocoa_l10n_util