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One such problematic pref at the moment is
kHintsFetcherHostsSuccessfullyFetched found while diagnosing
unexpected failures in
https://chromium-review.googlesource.com/c/chromium/src/+/1818219 which
makes microseconds-since-epoch a realistic (very large) number in
unit tests.

R=miu@chromium.org

Bug: 1004987, 1007427, 634507
Change-Id: I5ebf6a0ef46e2aea704ab5c54372ae77cbe64afb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1822840
Commit-Queue: Gabriel Charette <gab@chromium.org>
Commit-Queue: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Auto-Submit: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699504}