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Leave that to the default value, or whatever value an HSTS header set.

TEST=net_unittests; after visiting https://www.mv-rechberghausen.de, query
that domain in chrome://net-internal/#hsts and expect pins AND mode STRICT.

BUG=226068


Review URL: https://chromiumcodereview.appspot.com/13483007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@193443 0039d316-1c4b-4281-b951-d872f2087c98