Roll DevTools Frontend from 2f2ee2383761 to 429410096af9 (4 revisions)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/2f2ee2383761..429410096af9

2020-10-20 changhaohan@chromium.org Remove ComputedStyleGrouping UMA in M88
2020-10-20 alexrudenko@chromium.org Enable TypeScript for TimelineIRModel.js
2020-10-20 tvanderlippe@chromium.org Remove all definitions of usesObjectNotation
2020-10-20 alcastano@google.com Use Markdown for Mixed Content related messages in the Issue tab

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/+doc/master/autoroll/README.md

Bug: chromium:1011811,chromium:1125465,chromium:1127956
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: I6e9e8c918616608965b48fbdb2d04fe38a8d0493
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2487162Reviewed-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@{#818907}

DEPS

@@ -277,7 +277,7 @@ 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': '2f2ee23837618c2414828ce9cbd06e042b332782',
+  'devtools_frontend_revision': '429410096af9590d9d7ed6891dda7ab157481543',
   # 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.