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Using TerminateProcess to exit from utility processes has dropped the
crash rate significantly so it makes sense to apply the same recipe to
ppapi processes. Over 80% of utility and ppapi process crashes are
during shutdown so using TerminateProcess will get rid of most of the
crashes, thus making triage easier.

TerminateProcess is also faster.

Bug: 1024560
Change-Id: I214e0bdcaddfdac41a7d6f5dd2ff3a0e749871a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1972896Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726165}