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This is a reland of cdcb0262, which was
reverted pending a fix for an underlying Mojo message-loss issue on
channel shutdown.

Original change's description:
> Add missing message-received expectation to IPCMojoBootstrapTest.
>
> 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/955554
> Reviewed-by: Ken Rockot <rockot@chromium.org>
> Commit-Queue: Wez <wez@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#542296}

TBR: rockot
Bug: 816620
Change-Id: Ifdf10581091be31a6c9d1aa53542f2ed6c2ccbfa
Reviewed-on: https://chromium-review.googlesource.com/958016Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542650}