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Adding this flag prevents sandbox_type.cc complaining about valid
sandbox configuration missing in a command line.

Change-Id: I076aaf51411c187e36f3b08f6eb5e50199b2b804
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446656
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Auto-Submit: Peter Kvitek <kvitekp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813429}