Cambio en magento

public function login($username, $password)
    {
        /** @var $customer Mage_Customer_Model_Customer */
        $customer = Mage::getModel('customer/customer')
            ->setWebsiteId(Mage::app()->getStore()->getWebsiteId());

        if ($customer->authenticate($username, $password)) {
            $this->setCustomerAsLoggedIn($customer);
            //$this->renewSession();
            return true;
        }
        return false;
    }