Fix a crash on triggering bookmark menu directions by the arrow keys.

chrome/browser/ui/gtk/bookmarks/bookmark_bar_gtk.cc

Index: chrome/browser/ui/gtk/bookmarks/bookmark_bar_gtk.cc
diff --git a/chrome/browser/ui/gtk/bookmarks/bookmark_bar_gtk.cc b/chrome/browser/ui/gtk/bookmarks/bookmark_bar_gtk.cc
index b6082eb8b66b12549943428a9b1bf7841e279556..f4fae316eb202be1636404c9ac967258d970c870 100644
--- a/chrome/browser/ui/gtk/bookmarks/bookmark_bar_gtk.cc
+++ b/chrome/browser/ui/gtk/bookmarks/bookmark_bar_gtk.cc
@@ -419,7 +419,9 @@ void BookmarkBarGtk::PopupForButtonNextTo(GtkWidget* button,
   const int first_hidden = GetFirstHiddenBookmark(0, &folder_list);
   if (first_hidden != -1)
     folder_list.push_back(overflow_button_);
-  folder_list.push_back(other_bookmarks_button_);
+
+  if (!model_->other_node()->empty())
+    folder_list.push_back(other_bookmarks_button_);
 
   // Find the position of |button|.
   int button_idx = -1;