Roll src/third_party/devtools-frontend/src bbddcc4a938a..2f6ac2feb1de (5 commits)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/bbddcc4a938a..2f6ac2feb1de

git log bbddcc4a938a..2f6ac2feb1de --date=short --first-parent --format='%ad %ae %s'
2019-12-10 szuend@chromium.org Revert "Migrate test_runner/ to ESM"
2019-12-10 devtools-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com Update Devtools DEPS.
2019-12-10 vidorteg@microsoft.com Updating paths on generate_devtools_ui_strings.js
2019-12-09 liviurau@chromium.org Whitespace to trigger builders
2019-12-09 tvanderlippe@chromium.org Migrate test_runner/ to ESM

Created with:
  gclient setdep -r src/third_party/devtools-frontend/src@2f6ac2feb1de

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:1006759,chromium:1019182
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: I56f63e8780d1ccaf8124dc28ce2c175e606cb666
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1959775Reviewed-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@{#723284}

DEPS

@@ -243,7 +243,7 @@ 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': 'bbddcc4a938adbd38ec1a5a3ff07e54e389d9391',
+  'devtools_frontend_revision': '2f6ac2feb1dea9e51a828034dc0ad5962c72bee7',
   # 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.