Add ScopedMacRTL class for Cocoa browser RTL testing

chrome/browser/ui/cocoa/framed_browser_window.mm

Index: chrome/browser/ui/cocoa/framed_browser_window.mm
diff --git a/chrome/browser/ui/cocoa/framed_browser_window.mm b/chrome/browser/ui/cocoa/framed_browser_window.mm
index 65e14a23e2979575da4ec570af4bf26dacbcaae7..abd9ab24ff8d2665a4cfcadf89e73c5f6dcd224d 100644
--- a/chrome/browser/ui/cocoa/framed_browser_window.mm
+++ b/chrome/browser/ui/cocoa/framed_browser_window.mm
@@ -17,7 +17,7 @@
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #import "chrome/browser/ui/cocoa/browser_window_layout.h"
 #import "chrome/browser/ui/cocoa/browser_window_utils.h"
-#include "chrome/browser/ui/cocoa/l10n_util.h"
+#import "ui/base/cocoa/rtl_util.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_strip_controller.h"
 #import "chrome/browser/ui/cocoa/themed_window.h"
 #include "chrome/grit/theme_resources.h"
@@ -275,7 +275,7 @@ const CGFloat kWindowGradientHeight = 24.0;
   // should determine if current locale is RTL.
   NSLayoutXAxisAnchor* leadingSourceAnchor = [button leftAnchor];
   NSLayoutXAxisAnchor* leadingTargetAnchor = [[button superview] leftAnchor];
-  if (cocoa_l10n_util::ShouldFlipWindowControlsInRTL()) {
+  if (cocoa_rtl_util::ShouldFlipWindowControlsInRTL()) {
     leadingSourceAnchor = [button rightAnchor];
     leadingTargetAnchor = [[button superview] rightAnchor];
     leadingOffset = -leadingOffset;
@@ -338,7 +338,7 @@ const CGFloat kWindowGradientHeight = 24.0;
       break;
   }
 
-  if (cocoa_l10n_util::ShouldFlipWindowControlsInRTL()) {
+  if (cocoa_rtl_util::ShouldFlipWindowControlsInRTL()) {
     buttonFrame.origin.x =
         NSWidth([self frame]) - buttonFrame.origin.x - NSWidth([button frame]);
   }