docs: protected void removeExpiredPortletCookies(HttpServletRequest request) {
          Map<String, SessionOnlyPortletCookieImpl> sessionOnlyCookies =
                  getSessionOnlyPortletCookieMap(request);
          for (Entry<String, SessionOnlyPortletCookieImpl> entry : sessionOnlyCookies.entrySet()) {
              String key = entry.getKey();
              SessionOnlyPortletCookieImpl sessionOnlyCookie = entry.getValue();
              if (sessionOnlyCookie.getExpires().isBeforeNow()) {
                  sessionOnlyCookies.remove(key);
              }
          }
      }