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Before this change, we special case base::TimeDelta::Max() to mean we'd
like to cancel delayed processing of Background Sync registrations.

This introduces a CancelDelayedProcessing() flow to make code more
readable and get rid of this special case.

Bug: 996166
Change-Id: Iee5f78a8e8f9e9d2abd8cc1e3e78778807829011
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906408
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715282}