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This is a reland of 2a07cc57

Original change's description:
> Shutdown holding space delegates while device is suspended
>
> Some file systems are unmounted during device suspend (for example drive
> FS), which was causing the holding space file system delegate's file
> path removal detection to remove them from the holding space on device
> suspend. To avoid this issue, holding space keyed service now observes
> device suspend status and shuts down holding space delegates when the
> device suspends. The delegates are re-initialized when suspend ends,
> restoring the model from persistence again.
>
> BUG=1152924
>
> Change-Id: Iffe4586bcb87f47d687ceeff0fc76e60a443c0d5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2568355
> Commit-Queue: Toni Baržić <tbarzic@chromium.org>
> Reviewed-by: David Black <dmblack@google.com>
> Cr-Commit-Position: refs/heads/master@{#833515}

Bug: 1152924
Change-Id: I4ef1fa83d684260e4ebf66fe4c01e9627e5c46af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2573893Reviewed-by: David Black <dmblack@google.com>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833787}