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We have verified that tasks posted by SQLitePersistentCookieStore are
on the critical path of a page load. According to the documentation in
task_traits.h, being on the critical path of a page load requires
USER_BLOCKING priority.

We keep this as an experiment because we can to assess the impact of
this change when the WindowsThreadModeBackground feature is enabled.

Bug: 872820, 878222
Change-Id: Iec368de8f59b34703688d8f8811aedbeddc50a8d
Reviewed-on: https://chromium-review.googlesource.com/c/1303039Reviewed-by: Victor Costan <pwnall@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603308}