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This allowance seems like an unintentional overlook of the fact that
DidRunTask() runs microtasks. Microtasks should be treated the same
as regular application tasks and not be allowed to implicitly nest
application tasks.

R=altimin@chromium.org

Change-Id: Ie3f9d41d7525e465f813c7e2456cce3f4394ad57
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537002
Commit-Queue: Gabriel Charette <gab@chromium.org>
Auto-Submit: Gabriel Charette <gab@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827943}