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Announcement notification service is disabled for Guest profiles. This
CL updates it to be also disabled for ephemeral Guest profiles.

This change is behind disabled |EnableEphemeralGuestProfilesOnDesktop|
flag.
Please see go/ephemeral-guest-profiles for more context.

Bug: 1125474
Change-Id: I07188559a37470dc3f4dae3ee595a6cbae4cf2b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2470519Reviewed-by: Xing Liu <xingliu@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817361}