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Some of these tests expected a message from the child process, and would
verify that it was valid/invalid as expected, but would still pass if
no message were received at all.

Bug: 816620
Change-Id: Ie8acf85086f4416c7023118673c40d00a2e190d7
Reviewed-on: https://chromium-review.googlesource.com/955554Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542296}