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In incognito and guest profiles, the BadgeManagerFactory does not create
a BadgeManager. As there are no apps in incognito/guest profiles this
would not normally be a problem. However, in BadgeManager::BindRequest,
we were attempting to add the null BadgeManager to a mojo reciever set,
causing a crash.

Note: This does not affect the API exposed to the, so this cannot be
used to detect incognito mode.

Bug: 1004122
Change-Id: I5024665257a67aaaf28aa7f3bb8cd9cfcdef2d25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824041Reviewed-by: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Jay Harris <harrisjay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700073}