Roll Chrome Mac PGO Profile

Roll Chrome Mac PGO profile from chrome-mac-master-1607925234-ef20c18621d9ca5f7c0d39fedb05c76a05c36900.profdata to chrome-mac-master-1607968714-c306ec7882cc59048926f4cb1ac6492a09bdd2f6.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: I5ecabd006d5301fcbd61c9dcdf1ab0669f8c83dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2590406Reviewed-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@{#836768}

chrome/build/mac.pgo.txt

-chrome-mac-master-1607925234-ef20c18621d9ca5f7c0d39fedb05c76a05c36900.profdata
+chrome-mac-master-1607968714-c306ec7882cc59048926f4cb1ac6492a09bdd2f6.profdata