deleteCookies
Delete all cookies that match the specified parameters. If both |url| and |cookieName| values are specified all host and domain cookies matching both will be deleted. If only |url| is specified all host cookies (but not domain cookies) irrespective of path will be deleted. If |url| is empty all cookies for all hosts and domains will be deleted. Cookies can alternately be deleted using the visit*Cookies() methods.
Return
False if a non-empty invalid URL is secified or if cookies cannot be accessed.
Parameters
url
The cookie URL to delete or null.
cookieName
The cookie name to delete or null.