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For Periodic Background Sync, we decide the next event time for a
registration based on other existing periodicsync registrations for this
origin. Skip this check for one-shot Background Sync registrations.

Currently, if we have both a one-shot and a periodic Background Sync
registration for a given origin, this check will be applied to the
one-shot sync registration as well. This is unnecessary. This CL removes
it and adds a unit test.

Bug: 989003
Change-Id: Iff2b1d0444878444c6c1743f6ae0882caca86dc8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1725638Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682268}