Roll src/third_party/devtools-frontend/src 8ef250cfe144..2de1869d1c21 (3 commits)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/8ef250cfe144..2de1869d1c21

git log 8ef250cfe144..2de1869d1c21 --date=short --first-parent --format='%ad %ae %s'
2020-02-20 khamu@microsoft.com High contrast pass to dropdowns, buttons and links
2020-02-20 tvanderlippe@chromium.org Remove prototype wrangling for String formatters
2020-02-20 tvanderlippe@chromium.org Remove typedefs from {object_ui,network,layer_viewer,input,inline_editor}-legacy.js

Created with:
  gclient setdep -r src/third_party/devtools-frontend/src@2de1869d1c21

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:1048378,chromium:1050549
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: Ia17fbab8014a81526dc0893667cade5063bb423e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2067225Reviewed-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@{#743374}

DEPS

@@ -242,7 +242,7 @@ 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': '8ef250cfe14410a3afef90ffd28731b218391a55',
+  'devtools_frontend_revision': '2de1869d1c21ce67440e14eb4ecd659580972429',
   # 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.