Roll src/third_party/devtools-frontend/src f0e349172618..fced1b9a3942 (3 commits)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/f0e349172618..fced1b9a3942

git log f0e349172618..fced1b9a3942 --date=short --first-parent --format='%ad %ae %s'
2020-02-18 tvanderlippe@chromium.org Remove typedefs from timeline{_model}-legacy.js
2020-02-18 tvanderlippe@chromium.org Remove typedefs from web_audio-legacy.js
2020-02-18 devtools-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com Update DevTools DEPS.

Created with:
  gclient setdep -r src/third_party/devtools-frontend/src@fced1b9a3942

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
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: Id1c31fc2799d40e72112174ebf0e2d4c63032c87
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2061662Reviewed-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@{#742154}

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': 'f0e34917261826a527a2df7ec8643728ddaf0fbb',
+  'devtools_frontend_revision': 'fced1b9a39420a3f2546a10b94eccea5f968b274',
   # 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.