Roll Chrome Mac PGO Profile

Roll Chrome Mac PGO profile from chrome-mac-master-1608681510-8927c83b5ccd266ea3bc0bb5c167b260db8cc2a2.profdata to chrome-mac-master-1608702533-a7da6674f28d1e7f495e791f9b035771cce0a74c.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: Ia67d48afb1f8add6c34ce224a0dbf280d9eb167e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2599352Reviewed-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@{#839075}

chrome/build/mac.pgo.txt

-chrome-mac-master-1608681510-8927c83b5ccd266ea3bc0bb5c167b260db8cc2a2.profdata
+chrome-mac-master-1608702533-a7da6674f28d1e7f495e791f9b035771cce0a74c.profdata