phabricator - raise HSTS max-age to 1 year

Ide46c131 enabled HSTS one week ago with max-age
of 7 days. If there is nothing unexpected happened,
we can now raise the max-age to 1 year.

Bug: 38516
Change-Id: Ic07decaac2b4371c58f9c78401692b85c071d9ee