public function removeAdditionalCookie($cookie)
    {
        $additionalCookie = $this->_getData('_additional_cookie');
        if (!$additionalCookie || !is_array($additionalCookie)) {
            return $this;
        }

        if (isset($additionalCookie[$cookie])) {
            unset($additionalCookie[$cookie]);
        }

        $this->setData('_additional_cookie', $additionalCookie);
        return $this;
    }