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This reverts commit 2b4b4ee8.

Reason for revert: CrOS OOBE/login-screen failures

See crbug.com/968554
eg: https://ci.chromium.org/p/chromium/builders/ci/chromeos-kevin-rel/9026

Original change's description:
> ThreadPool: Do not run BEST_EFFORT tasks during startup.
>
> With this CL, a task posted with:
>
> base::PostTaskWithTraits(
>     FROM_HERE,
>     {base::TaskPriority::BEST_EFFORT, ...},
>     base::BindOnce(...));
>
> Will not be allowed to run before startup is complete.
>
> The signal used to know that "startup is complete" is the same as
> AfterStartupTaskUtils. It is not perfect. It will be improved in a
> separate CL.
>
> This CL aims to be the smallest change possible to allow seamless
> migration of BrowserThread::PostAfterStartupTask() to
> base::PostTaskWithTraits().
>
> Bug: 887407
> Change-Id: I83ef387b82496ece3ed10c0c2466f42a6a5b19b3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1631668
> Commit-Queue: François Doray <fdoray@chromium.org>
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Reviewed-by: Carlos Caballero <carlscab@google.com>
> Reviewed-by: Gabriel Charette <gab@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#664488}

TBR=avi@chromium.org,gab@chromium.org,fdoray@chromium.org,carlscab@google.com

CQ_INCLUDE_TRYBOTS=luci.chromium.try:chromeos-kevin-rel
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 887407, 968554

Change-Id: I205b250267fd629b5da5db646d3b93c522642949
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1637005Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664826}