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This CL ensures that the PersonalDataManager is fully loaded before
tests start executing. Hopefully, this reduces some of the flakiness.

Also it fixes some blocked IO access which was not noticed because the
tests were disabled.

Bug: 1162474,1078506,500491,935629,1090343,281541
Change-Id: Ib9595484bb790305a84c2a389db66ec86ff2e8e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627369
Commit-Queue: Dominic Battré <battre@chromium.org>
Reviewed-by: Matthias Körber <koerber@google.com>
Cr-Commit-Position: refs/heads/master@{#843721}