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This change makes sure we save the clean exit value if the connection to
the child process is lost.

Bug: 911716
Change-Id: I9e0ac28e4ed18a3852fa157a4ce1295552d79bc4
Reviewed-on: https://chromium-review.googlesource.com/c/1370644Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615968}