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Drive is typically disallowed for directory-chooser dialogs because its
workaround for not having real files is only applied to files, but not
directories. With DriveFS, this is unnecessary since DriveFS files are
real so allow native or drive when native-only is requested when DriveFS
is enabled.

Change-Id: Ib56e7066cf6798d9d37ac2c2442f8fcf62a92be9
Reviewed-on: https://chromium-review.googlesource.com/1208992Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589102}