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post_task.h is now preferred to creating special purposed base::Threads

All this code needs is a SequencedTaskRunner which is allowed to
perform file I/O.

Furthermore, PlatformThread::Join() and hence Thread::Stop() will be
marked as a blocking operation in
https://chromium-review.googlesource.com/c/chromium/src/+/1324370
and this code was preventing that (even though in this case the
Join() was mostly a fast operation as there were no tasks left by the
time it was invoked).

R=chiniforooshan@chromium.org

Bug: 707362
Change-Id: Iec2f823e762cea2d1d1e775117fd95d871baa574
Reviewed-on: https://chromium-review.googlesource.com/c/1338178Reviewed-by: Ehsan Chiniforooshan <chiniforooshan@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608610}