GitLab

Mac no longer uses launch_posix.cc and all process creation goes through
posix_spawn now.

Bug: 179923
Change-Id: I5206cace69ea7863a72b58e1a59f2465492d4cbd
Reviewed-on: https://chromium-review.googlesource.com/c/1313334Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604982}