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In guest mode, shared files in the .WebShare/ directory are deleted
when the user logs off (if they are not deleted earlier).

In incognito mode, we continue to prevent file sharing.

Bug: 1161373
Change-Id: I0542d4ba92381c7ab2f07bbab896242bcc643057
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626991
Commit-Queue: Glen Robertson <glenrob@chromium.org>
Reviewed-by: Glen Robertson <glenrob@chromium.org>
Auto-Submit: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843298}