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This CL sets the shutdown parameters of child processes regardless of
whether the build is Google Chrome or Chromium. This fixes the issue
where sad tabs might briefly appear during logoff/shutdown on
Chromium builds.

BUG=1043938
TEST=load tabs in Chromium, log off user, check no sad tabs appear.

Change-Id: I488f3d276a4ea93892527c39561d15a64e247127
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2025771Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: Will Harris <wfh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736569}