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https://crrev.com/0e45f8023 somehow lost this logic before
landing, probably during extensive debugging churn. :{

Without this, it's possible for Mach port transfer to fail
when sending to a new process. Seems to have gone undetected
in production so far, but https://crrev.com/3e126191 managed
to trip over it consistently in ipc_tests.

Bug: 753541
Change-Id: I835dc5f26326718af678acd6199c285d709b9040
Reviewed-on: https://chromium-review.googlesource.com/1134079Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574418}