Add ScopedMacRTL class for Cocoa browser RTL testing

chrome/browser/ui/cocoa/browser_window_layout.mm

Index: chrome/browser/ui/cocoa/browser_window_layout.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_layout.mm b/chrome/browser/ui/cocoa/browser_window_layout.mm
index 95819323bd8cf1055aa254077f5146262b118a74..4e673553eb4d0312aa1b4f2c2fb81bddcad840dc 100644
--- a/chrome/browser/ui/cocoa/browser_window_layout.mm
+++ b/chrome/browser/ui/cocoa/browser_window_layout.mm
@@ -9,8 +9,8 @@
 
 #include "base/logging.h"
 #include "base/mac/mac_util.h"
-#include "chrome/browser/ui/cocoa/l10n_util.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_strip_controller.h"
+#import "ui/base/cocoa/rtl_feature.h"
 
 namespace chrome {
 
@@ -264,8 +264,8 @@ const CGFloat kLocationBarRightOffset = 35;
   }
   layout.trailingIndent = width - maxX;
 
-  if (cocoa_l10n_util::ShouldDoExperimentalRTLLayout()) {
-    if (cocoa_l10n_util::ShouldFlipWindowControlsInRTL())
+  if (ui::ShouldDoExperimentalRTLLayout()) {
+    if (ui::ShouldFlipWindowControlsInRTL())
       layout.avatarFrame.origin.x =
           width - parameters_.avatarSize.width - layout.avatarFrame.origin.x;
     else