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This code was used to deal with mounting rar files located in the legacy
drive file system. Now that DriveFS is default, this is no longer
needed.

Bug: 1003238
Test: manually mounted/unmounted zip and rar files on DUT
Change-Id: I75ab0da2ba26f8f004f1b48ac5bb9f2d2158c6b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1826752
Commit-Queue: Austin Tankiang <austinct@chromium.org>
Reviewed-by: Anand Mistry <amistry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701482}