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As of M78, UserDataDir may point to the root of a volume.

BUG=619133
R=zmin@chromium.org

Change-Id: Ic9c004c388656abacb3cebf4c8faae4b625bb936
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2148734
Auto-Submit: Greg Thompson <grt@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758828}