Roll Catapult from 306f03788f83 to 4f6c1bb4191b (3 revisions)

https://chromium.googlesource.com/catapult.git/+log/306f03788f83..4f6c1bb4191b

2020-10-26 yuhengh@chromium.org Support testing WebUI in non-content area
2020-10-26 bsheedy@chromium.org [devil] Only raise exception if forwarder not killed
2020-10-26 brucedawson@chromium.org Reduce warning output in tests

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/catapult-autoroll
Please CC zhanliang@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.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:chromeos-kevin-rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Bug: chromium:1038789,chromium:1084931,chromium:1099917
Tbr: zhanliang@google.com
Change-Id: I86592b8a568adde7aeb83b76943275c7ff9d93b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500241Reviewed-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@{#820989}

DEPS

@@ -269,7 +269,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling catapult
   # and whatever else without interference from each other.
-  'catapult_revision': '306f03788f83474ea0a99e9f5b89b535501e4c5a',
+  'catapult_revision': '4f6c1bb4191b02b2c00a9d3e8ad7224c219253bc',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libFuzzer
   # and whatever else without interference from each other.