Roll src/third_party/devtools-frontend/src 98b339fb3c01..c6be6446360c (2 commits)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/98b339fb3c01..c6be6446360c

git log 98b339fb3c01..c6be6446360c --date=short --first-parent --format='%ad %ae %s'
2020-03-16 tvanderlippe@chromium.org Remove run_old_devtools scripts
2020-03-16 tvanderlippe@chromium.org Add karma-sourcemap-loader to node_modules

Created with:
  gclient setdep -r src/third_party/devtools-frontend/src@c6be6446360c

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: chromium:1061125
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: Iafcda475105124de37ef1dbe1e8df294af508f76
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2105406Reviewed-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@{#750650}

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': '98b339fb3c0121567f615235bf63bc354d5af73e',
+  'devtools_frontend_revision': 'c6be6446360cb6e4e3d266290725cc4aaac7b4ab',
   # 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.