[Mac] Don't flip window controls in RTL for macOS < 10.12

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 77139739d6a4fe501c0b114991bcaeca395e1f4d..73db01d423dc3cc07cc90f4444bb793e6e918b41 100644
--- a/chrome/browser/ui/cocoa/l10n_util.mm
+++ b/chrome/browser/ui/cocoa/l10n_util.mm
@@ -5,6 +5,7 @@
 #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"
@@ -91,4 +92,8 @@ bool ShouldDoExperimentalRTLLayout() {
          base::FeatureList::IsEnabled(kExperimentalMacRTL);
 }
 
+bool ShouldFlipWindowControlsInRTL() {
+  return ShouldDoExperimentalRTLLayout() && base::mac::IsAtLeastOS10_12();
+}
+
 }  // namespace cocoa_l10n_util