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This makes handling of Chrome's own fatal messages consistent with
handling of system errors.

BUG=764415
R=siggi@chromium.org,sky@chromium.org

Change-Id: If60f3366d38d719741918982ce02265a766a3c08
Reviewed-on: https://chromium-review.googlesource.com/741232Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512778}