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|task_is_worker_task| was hard to read as it identified what
|task| would become but that variable doesn't exist when
BeforeRunTask() is invoked. The answer from BeforeRunTask() is more
accurately "should_run_tasks".

R=etiennep@chromium.org

Change-Id: I9c581c5d4b477dbe06d8c2ecab9f844f649674ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2105958
Auto-Submit: Gabriel Charette <gab@chromium.org>
Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753450}