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

Nothing to show in 'Other Bookmarks' when the folder is empty and not
visible in the bookmarks bar. So, prevent moving selection to the
hidden 'Other Bookmarks' folder to avoid a crash.

BUG=275284

Review URL: https://chromiumcodereview.appspot.com/22887030

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221813 0039d316-1c4b-4281-b951-d872f2087c98

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;