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This is a temporary workaround as the XPC used to show alert style
notifications does not work on 10.15+. Showing those as banners is
not ideal as they auto dismiss into the notifications center but it
is better than not showing them at all.

Bug: 1007418
Change-Id: Ib50ed9f2125b7bdf5885b5ffd63e81137e50e2a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1883648Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Richard Knoll <knollr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709887}