Roll Skia from 4c4c80fa1264 to 4c0b9b90d63a (1 revision)

https://skia.googlesource.com/skia.git/+log/4c4c80fa1264..4c0b9b90d63a

2021-02-19 jvanverth@google.com Revert "Test mac system font variations."

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-skiabot-test-autoroll
Please CC borenet@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

Tbr: borenet@google.com
Change-Id: Iba62abb606e0fd642b588b94f0971b9af96d5433
Reviewed-on: https://skia-review.googlesource.com/c/skiabot-test/+/375598
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
diff --git a/DEPS b/DEPS
index a8253e9..bb0992d 100644
--- a/DEPS
+++ b/DEPS
@@ -3,7 +3,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.
-  'skia_revision': '4c4c80fa12649e2512e4601d0a19f19f8907d6ca',
+  'skia_revision': '4c0b9b90d63a155a7137dd1ebe08f74222051fb6',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.