Roll src/third_party/devtools-frontend/src 715c8c459f00..af976e22c803 (2 commits)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/715c8c459f00..af976e22c803

git log 715c8c459f00..af976e22c803 --date=short --first-parent --format='%ad %ae %s'
2020-03-11 devtools-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com Update DevTools Chromium DEPS.
2020-03-11 devtools-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com Update DevTools DEPS.

Created with:
  gclient setdep -r src/third_party/devtools-frontend/src@af976e22c803

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/devtools-frontend-chromium
Please CC devtools-waterfall-sheriff-onduty@grotations.appspotmail.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

Bug: None
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: Ied4f9144124e054e5ab8229452171deab417fc5a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094631Reviewed-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@{#749077}

DEPS

@@ -246,7 +246,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling devtools-frontend
   # and whatever else without interference from each other.
-  'devtools_frontend_revision': '715c8c459f00def9ee77146442633fd015990a94',
+  'devtools_frontend_revision': 'af976e22c803c07f578a59826583ab72d5faa246',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libprotobuf-mutator
   # and whatever else without interference from each other.