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This sandboxes utility processes with the V2 sandbox on macOS.

Bug: 689306
Change-Id: Ie7cca11834f060a4c0f59862f68de95c79893288
Reviewed-on: https://chromium-review.googlesource.com/817515Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Commit-Queue: Greg Kerr <kerrnel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524233}