Roll Chrome Mac PGO Profile

Roll Chrome Mac PGO profile from chrome-mac-master-1608141458-a5500324610cca8317ad489f360bbb6633944839.profdata to chrome-mac-master-1608163120-6c9e93d828b8e2586093ed8c8e6e7f26f6a53c36.profdata

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/pgo-mac-chromium
Please CC pgo-profile-sheriffs@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Cq-Include-Trybots: luci.chrome.try:mac-chrome
Tbr: pgo-profile-sheriffs@google.com
Change-Id: I2c5b06b286feb317e2621986c90c193a117efd0d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2596740Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#837891}

chrome/build/mac.pgo.txt

-chrome-mac-master-1608141458-a5500324610cca8317ad489f360bbb6633944839.profdata
+chrome-mac-master-1608163120-6c9e93d828b8e2586093ed8c8e6e7f26f6a53c36.profdata