system_api: Add cros_disks::kFileSystemType.

BUG=chromium:274041
TEST=None

Change-Id: I6c5d9b324a1721dd63822b7dd4fdaaf2f6099c48
Reviewed-on: https://chromium-review.googlesource.com/608727
Reviewed-by: Ben Chan <benchan@chromium.org>
Tested-by: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Commit-Queue: Klemen Kozjek <klemenko@google.com>
1 file changed