Rename and move ExperimentalMacRTL flag

chrome/browser/ui/cocoa/l10n_util.h

Index: chrome/browser/ui/cocoa/l10n_util.h
diff --git a/chrome/browser/ui/cocoa/l10n_util.h b/chrome/browser/ui/cocoa/l10n_util.h
index a11318f3252646813d802a55851bba6b8adf687c..cf36a2229a3d8da367555b3c68d2c48ac5fa8110 100644
--- a/chrome/browser/ui/cocoa/l10n_util.h
+++ b/chrome/browser/ui/cocoa/l10n_util.h
@@ -37,12 +37,10 @@ NSString* ReplaceNSStringPlaceholders(NSString* formatString,
 // Generates a tooltip string for a given URL and title.
 NSString* TooltipForURLAndTitle(NSString* url, NSString* title);
 
-extern const base::Feature kExperimentalMacRTL;
 // Returns whether both:
-// 1) Experimental Mac RTL support is enabled via the ExperimentalMacRTL
-//    feature;
+// 1) Mac RTL support is enabled via the MacRTL feature;
 // 2) The browser UI is in RTL mode.
-// If ExperimentalMacRTL becomes the default, this function can be replaced with
+// If MacRTL becomes the default, this function can be replaced with
 // uses of base::i18n::IsRTL().
 bool ShouldDoExperimentalRTLLayout();