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Previously, cache.dat was only updated once on startup (before loading
XML sitelists from prefs), and then after all the XML sitelists were
done downloading & parsing.

This left a 1-minute period of time where cache.dat and Chrome's state
didn't match. This would cause some back-and-forth switching between
the two.

Bug: 993054
Change-Id: Idb4da1c102a86392b88d7060664b16e1680c2deb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1798526
Commit-Queue: Julian Pastarmov <pastarmovj@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Auto-Submit: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695964}