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This fixes crashes in incognito mode where CrostiniManager is null.

Bug: 1038164
Change-Id: I9da95285a32a643246c4b16376f0af4fa2c31567
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2024587Reviewed-by: Julian Watson <juwa@google.com>
Commit-Queue: Julian Watson <juwa@google.com>
Auto-Submit: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735737}