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This reverts commit 436c119d.

Reason for revert: An edge case for platforms without ARC++ was not handled correctly.

Original change's description:
> Disable unmount-on-suspend for FUSE
>
> This removes the code for unmounting the FUSEs (filesystem in userspace)
> on suspend. Instead of unmounting to resolve the FUSE/freeze on suspend
> race condition, we will be using powerd code that orders freeze using
> freezer cgroups.
>
> Crostini still has some work left to do before this can be done for it,
> so unmount on suspend for its FUSE, sshfs, will be done in a later
> patch.
>
> Test: "suspend_stress_test -c 2500" on device
> Bug: b/134792837
> Change-Id: Icb8f9e309f6780e6f935be550c6c4e048a44b1fd
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2336869
> Commit-Queue: Derek Basehore <dbasehore@chromium.org>
> Reviewed-by: Joel Hockey <joelhockey@chromium.org>
> Reviewed-by: Sergei Datsenko <dats@chromium.org>
> Reviewed-by: James Cook <jamescook@chromium.org>
> Reviewed-by: David Munro <davidmunro@google.com>
> Cr-Commit-Position: refs/heads/master@{#811950}

TBR=jamescook@chromium.org,achuith@chromium.org,dbasehore@chromium.org,joelhockey@chromium.org,dats@chromium.org,davidmunro@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: b/134792837
Change-Id: Ia50e43dceeb0eea448d6fdf7232af328a9a1fd1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2451400Reviewed-by: David Munro <davidmunro@google.com>
Reviewed-by: Sergei Datsenko <dats@chromium.org>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Derek Basehore <dbasehore@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814910}