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When the enterprise only allows the users to use incognito mode, Chrome
should be started up in incognito mode.

Bug: 1165405
Change-Id: Ic08059527becb7ce9210f693dea2679870678247
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2641181
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845572}