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macOS's extended chmod syntax can be used for either users or groups,
and supports "user:<user>" and "group:<group>" to resolve ambiguities.
This causes problems if the username is "user", as chmod can't parse
the ACL in this case. This CL prepends "user:" to all ACLs to avoid
this problem.

Change-Id: I15c143b94a2c3113f518ed2b558f007ad769d0c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088397
Auto-Submit: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Gary Kacmarcik <garykac@chromium.org>
Reviewed-by: Gary Kacmarcik <garykac@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748771}