Make HSTS headers not clobber preloaded pins.
BUG=329386
TEST=With a fresh profile, ensure that accounts.google.com and twitter.com
have public keys pinned. (Check chrome://net-internals/#hsts.) Then visit
those sites. Close the browser, re-launch it, and check that the pins are
still present in a query in chrome://net-internals/#hsts.
Review URL: https://codereview.chromium.org/103803012
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@268966 0039d316-1c4b-4281-b951-d872f2087c98
16 files changed
