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WakeOnWifiConnectObserver seems like a good candidate to be converted
to a KeyedService, but its lifetime doesn't match up with Profile
lifetime very well (particularly due to being destroyed early in some
cases).

It's not necessary to listen for profile destruction because normal
profiles aren't destroyed until browser shutdown, by which time
WakeOnWifiManager is gone. OTR profiles aren't observed since they
are never added to the ProfileManager.

Bug: 268984
Change-Id: Ie669931e04661363b4080c329e708beeb00ba53c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1867124
Commit-Queue: Evan Stade <estade@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707528}