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Allow clients to provide a callback in

for now.

chromeos: :AccountManager::InitializeInEphemeralMode. Used only in tests
Change-Id: Ib1da37327d9d3c87865957b3286c59d6d48ed8a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421813
Commit-Queue: Kush Sinha <sinhak@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809984}