History sniffing with HSTS and CSP. Upstream bug(s): https://code.google.com/p/chromium/issues/detail?id=544765 External References: http://googlechromereleases.blogspot.com/2016/01/stable-channel-update_20.html
This issue has been addressed in the following products: Supplementary for Red Hat Enterprise Linux 6 Via RHSA-2016:0072 https://rhn.redhat.com/errata/RHSA-2016-0072.html