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Unsharing a crostini folder can fail if a user has a file
open in some application.  When this happens, we will show
a dialog to the user to inform them that unsharing has
failed and allow them to retry the unsharing presumably
after they have closed associated files.

Bug: 920416
Change-Id: I303200f7e0e40fe8c7e1382bf19878d7ed2b31fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037276Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Julian Watson <juwa@google.com>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738462}