Add ScopedMacRTL class for Cocoa browser RTL testing

chrome/browser/ui/cocoa/l10n_util.mm

Index: chrome/browser/ui/cocoa/l10n_util.mm
diff --git a/chrome/browser/ui/cocoa/l10n_util.mm b/chrome/browser/ui/cocoa/l10n_util.mm
index 73db01d423dc3cc07cc90f4444bb793e6e918b41..7c3b4adb2c699ffc74dda1f93fe079e4f710f159 100644
--- a/chrome/browser/ui/cocoa/l10n_util.mm
+++ b/chrome/browser/ui/cocoa/l10n_util.mm
@@ -4,8 +4,6 @@
 
 #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"
@@ -84,16 +82,4 @@ NSString* TooltipForURLAndTitle(NSString* url, NSString* title) {
     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