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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}