Rename and move ExperimentalMacRTL flag

chrome/common/chrome_features.cc

Index: chrome/common/chrome_features.cc
diff --git a/chrome/common/chrome_features.cc b/chrome/common/chrome_features.cc
index 521c203616d61a5d5e691f6373993e871f4cb976..cee680d7e0880dbb4680307bebe1bf1b69cd5c43 100644
--- a/chrome/common/chrome_features.cc
+++ b/chrome/common/chrome_features.cc
@@ -180,6 +180,11 @@ const base::Feature kLinuxObsoleteSystemIsEndOfTheLine{
 const base::Feature kLsdPermissionPrompt{"LsdPermissionPrompt",
                                          base::FEATURE_DISABLED_BY_DEFAULT};
 
+#if defined(OS_MACOSX)
+// Enables RTL layout in macOS top chrome.
+const base::Feature kMacRTL{"MacRTL", base::FEATURE_DISABLED_BY_DEFAULT};
+#endif
+
 // Enables or disables the Material Design version of chrome://bookmarks.
 const base::Feature kMaterialDesignBookmarks{"MaterialDesignBookmarks",
                                              base::FEATURE_DISABLED_BY_DEFAULT};