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Startup browser creator is updated to support ephemeral Guest profiles.
Ephemeral Guest profiles are not off-the-record and will deprecate OTR
Guest profiles.

This change is behind disabled EnableEphemeralGuestProfilesOnDesktop
flag. Please see go/guest-on-disk for more context.

Bug: 1125474
Change-Id: I7af1cbf8e799e7387a6a96ca018bc772009d1205
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2449335
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Tommy Martino <tmartino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815166}