During upgrade to the Chromium 61 we have switched from GTK2 to GTK3
and now we have a few warnings about stuff being deprecated in GTK3.
Check any Linux build to get a list of them.

/cc @zcbenz 
atom/browser/ui/message_box_gtk.cc
MessageBoxType type,
                    const std::vector<std::string>& buttons,
                    int default_id,
                    int cancel_id,
                    int options,
                    const std::string& title,
                    const std::string& message,
                    const std::string& detail,
                    const std::string& checkbox_label,
                    bool checkbox_checked,
                    const gfx::ImageSkia& icon,
                    const MessageBoxCallback& callback) {
  (new GtkMessageBox(parent, type, buttons, default_id, cancel_id, title,
                     message, detail, checkbox_label, checkbox_checked, icon))
      ->RunAsynchronous(callback);
}
void ShowErrorBox(const base::string16& title, const base::string16& content) {