Add ScopedMacRTL class for Cocoa browser RTL testing

chrome/browser/ui/cocoa/browser_window_controller.mm

Index: chrome/browser/ui/cocoa/browser_window_controller.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller.mm b/chrome/browser/ui/cocoa/browser_window_controller.mm
index cffc7903dba949c70785bf87e4f1da21218f1e2f..41d19e8eec3044d03e94de4e32b9e4831a75e968 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller.mm
@@ -61,7 +61,6 @@
 #import "chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_editor.h"
 #import "chrome/browser/ui/cocoa/fullscreen/fullscreen_toolbar_visibility_lock_controller.h"
 #import "chrome/browser/ui/cocoa/fullscreen/fullscreen_toolbar_controller.h"
-#include "chrome/browser/ui/cocoa/l10n_util.h"
 #import "chrome/browser/ui/cocoa/profiles/avatar_base_controller.h"
 #import "chrome/browser/ui/cocoa/profiles/avatar_button_controller.h"
 #import "chrome/browser/ui/cocoa/profiles/avatar_icon_controller.h"
@@ -94,6 +93,7 @@
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
 #import "ui/base/cocoa/cocoa_base_utils.h"
+#import "ui/base/cocoa/rtl_feature.h"
 #import "ui/base/cocoa/nsview_additions.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/display/screen.h"
@@ -1635,7 +1635,7 @@ bool IsTabDetachingInFullscreenEnabled() {
       [[AvatarIconController alloc] initWithBrowser:browser_.get()]);
   }
   view = [avatarButtonController_ view];
-  if (cocoa_l10n_util::ShouldDoExperimentalRTLLayout())
+  if (ui::ShouldDoExperimentalRTLLayout())
     [view setAutoresizingMask:NSViewMaxXMargin | NSViewMinYMargin];
   else
     [view setAutoresizingMask:NSViewMinXMargin | NSViewMinYMargin];