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When a certificate error recurs multiple times within a browsing session, we add
a special message to the interstitial. This CL adds a Finch-controlled mode
where the count of certificate errors is stored in a pref instead of in memory,
so that we can trigger the recurrent error message when an error recurs within a
certain period of time (even spanning browsing sessions). We might want to roll
out this pref mode on certain platforms (like Android) where browsing sessions
might be significantly shorter than desktop.

Bug: 839969
Change-Id: I04f1af1aa30043821859f4459602627b9ba7af77
Reviewed-on: https://chromium-review.googlesource.com/1053563
Commit-Queue: Emily Stark <estark@chromium.org>
Reviewed-by: Christopher Thompson <cthomp@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557966}