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This guards against a resource exhaustion in the
UNIX sockets space.

Bug: chromium:826957
Change-Id: I0b55ff033812b1778793f0d27398012c557b8e3a
Reviewed-on: https://chromium-review.googlesource.com/995433Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Tommi <tommi@chromium.org>
Commit-Queue: Harald Alvestrand <hta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550145}