Roll src/third_party/catapult 4cd621ee21ae..4d0d7a730b7b (3 commits)

https://chromium.googlesource.com/catapult.git/+log/4cd621ee21ae..4d0d7a730b7b

git log 4cd621ee21ae..4d0d7a730b7b --date=short --first-parent --format='%ad %ae %s'
2019-12-20 dberris@chromium.org Reduce concurrent request cap
2019-12-20 fancl@chromium.org Relaxing the restriction on max_num_instances of sheriff_config
2019-12-20 dberris@chromium.org Re-route API traffic to the API service

Created with:
  gclient setdep -r src/third_party/catapult@4d0d7a730b7b

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 nuskos@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/+/master/autoroll/README.md

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_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:953181
Tbr: nuskos@google.com
Change-Id: I89c47148dae18ec80bdcf89ae26ba1a63b60ca34
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1978246Reviewed-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@{#726711}

DEPS

@@ -238,7 +238,7 @@ 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': '4cd621ee21ae6b7856e29df263a96297199de2ec',
+  'catapult_revision': '4d0d7a730b7b450debf71750b9dfb77297cc9bbb',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libFuzzer
   # and whatever else without interference from each other.