[Mac] Mirror bookmark bubble folder dropdown in RTL

chrome/browser/ui/cocoa/bookmarks/bookmark_bubble_controller.mm

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_bubble_controller.mm
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_bubble_controller.mm b/chrome/browser/ui/cocoa/bookmarks/bookmark_bubble_controller.mm
index 4375e5b96902fff2e02fc71d55a1082ec20ee2e3..573498fb6a76ed5a1c0a74b79dd5f26cd3850587 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_bubble_controller.mm
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_bubble_controller.mm
@@ -329,6 +329,12 @@ using bookmarks::BookmarkNode;
   cocoa_l10n_util::FlipAllSubviewsIfNecessary([nameTextField_ superview]);
   // Relative order of the done and options buttons.
   cocoa_l10n_util::FlipAllSubviewsIfNecessary(trailingButtonContainer_);
+  if (cocoa_l10n_util::ShouldDoExperimentalRTLLayout()) {
+    // Fix up pop-up button from the nib.
+    [folderPopUpButton_ setUserInterfaceLayoutDirection:
+                            NSUserInterfaceLayoutDirectionRightToLeft];
+    [folderPopUpButton_ setAlignment:NSNaturalTextAlignment];
+  }
 }
 
 @end  // BookmarkBubbleController