The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/91e95822f8b6a0cd091ceeecb953c11e99d98727

commit 91e95822f8b6a0cd091ceeecb953c11e99d98727
Author: spqchan <spqchan@chromium.org>
Date: Thu May 10 01:46:12 2018

Remove Mac OSX 10.9 code in base/sys_info_mac.mm

10.9 is no longer supported.

Bug:  840451 
Change-Id: I4b4c6901148244b449adfe26f759d2740cc17667
Reviewed-on: https://chromium-review.googlesource.com/1048131
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Sarah Chan <spqchan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557415}
[modify] https://crrev.com/91e95822f8b6a0cd091ceeecb953c11e99d98727/base/sys_info_mac.mm