Add ScopedMacRTL class for Cocoa browser RTL testing

chrome/browser/ui/cocoa/base_bubble_controller.mm

Index: chrome/browser/ui/cocoa/base_bubble_controller.mm
diff --git a/chrome/browser/ui/cocoa/base_bubble_controller.mm b/chrome/browser/ui/cocoa/base_bubble_controller.mm
index ffaae11522d5c581107e08c4c31b15899c525a6d..77e8b8d0677da7e79ebe0429e7df58d62d097692 100644
--- a/chrome/browser/ui/cocoa/base_bubble_controller.mm
+++ b/chrome/browser/ui/cocoa/base_bubble_controller.mm
@@ -14,10 +14,10 @@
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #import "chrome/browser/ui/cocoa/info_bubble_view.h"
 #import "chrome/browser/ui/cocoa/info_bubble_window.h"
-#include "chrome/browser/ui/cocoa/l10n_util.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_strip_model_observer_bridge.h"
 #include "components/bubble/bubble_controller.h"
 #include "ui/base/cocoa/cocoa_base_utils.h"
+#import "ui/base/cocoa/rtl_feature.h"
 
 @interface BaseBubbleController (Private)
 - (void)registerForNotifications;
@@ -404,7 +404,7 @@
   NSWindow* window = [self window];
   NSPoint origin = anchor_;
 
-  BOOL isRTL = cocoa_l10n_util::ShouldDoExperimentalRTLLayout();
+  BOOL isRTL = ui::ShouldDoExperimentalRTLLayout();
   switch ([bubble_ alignment]) {
     case info_bubble::kAlignArrowToAnchor: {
       NSSize offsets = NSMakeSize(info_bubble::kBubbleArrowXOffset +