GitLab

TaskQueueImpl::SweepCancelledTasks doesn't have to know about
SequenceManager.

R=skyostil@chromium.org,alexclarke@chromium.org

Change-Id: Ifad12c6fe652a323b776066a49aeb6e11f14e515
Reviewed-on: https://chromium-review.googlesource.com/c/1349265Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Commit-Queue: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611819}