Delete Cookie with Name
Delete All Cookies
User can delete a cookie from the browser's "cookie jar". The domain of the cookie will be ignored.
User can delete the named cookie from the current domain. This is equivalent to setting the named cookie's expiry date to sometime in the past.
User can also delete all the cookies for the current domain using driver.manage().deleteAllCookies();
Deleting the specific cookie with cookie name "--utmb"