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Use WaitForMultiprocessTestChildExit() instead of
base::Process::WaitForExitWithTimeout() to wait for multiprocess test
child processes to complete. It's identical to WaitForExitWithTimeout()
on macOS/Windows/Linux but also works on Android. (Android tests don't
fork so they use a special process monitoring mechanism.)

Bug: 973167
Change-Id: I3c3f10a155d4ea9058404ae7474cfacdcf2ed402
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1668335
Auto-Submit: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671908}