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This filesystem type was used by the legacy drive sync client that has
now been replaced by DriveFS. Also replace all usages in tests of this
filesystem type with an equivalent type.

Bug: 1003238
Change-Id: I5f99a3eaca6887423cb1ec073f5f9b22e83b694b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1946050Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Austin Tankiang <austinct@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720814}