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No TaskTraits implcitly meant base::ThreadPool. The migration away
from this paradigm is complete (task APIs v3 is bringing explicit
API-as-destination). Remove this right away before we're ready to
completely remove post_task.h to avoid the addition of new callers
without an explicit destination.

Bug: 968047, 1026641
Change-Id: I54d04872498d340cfd8ec02aa88b3e9cba1a7547
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225541
Commit-Queue: Gabriel Charette <gab@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774758}