Document new vulnerabilities in www/chromium < 39.0.2171.65

Obtained from:	http://googlechromereleases.blogspot.nl/2014/11/stable-channel-update_18.html


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@372740 35697150-7ecd-e111-bb59-0022644237b5