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Starting from 10.12, system_profiler no longer contains the line
"Retina: Yes" (or No), so we need to detect Retina by looking at the
Resolution field instead.

Besides, we now realize that our Retina bots are actually running 10.12
(despite their names saying 10.11, which will be fixed in other CLs),
so Retina is changed to fall back to Mac 10.12 instead of 10.11.

Lastly, rebaseline.

Bug: 818558, 819851
Change-Id: Ie3ed6ef7d090590f411a1701b72be920498c9769
Reviewed-on: https://chromium-review.googlesource.com/957306
Commit-Queue: Robert Ma <robertma@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542306}