Roll DevTools Frontend from ea9b5bbcb53e to e2ffb3742633 (5 revisions)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/ea9b5bbcb53e..e2ffb3742633

2021-01-12 tvanderlippe@chromium.org Remove Closure-related types in legacy-defs
2021-01-12 tvanderlippe@chromium.org Move String.hashCode into string-utilities
2021-01-12 tvanderlippe@chromium.org Move unescapeCssString into elements/
2021-01-12 jacktfranklin@chromium.org Remove Set#firstValue proto method
2021-01-12 tvanderlippe@chromium.org [module.json extensions] coverage

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:1050549,chromium:1134103
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: I1b74af1acfe9a5ed67e93cb5aab2114ffeaf8943
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2624948Reviewed-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@{#842641}

DEPS

@@ -274,7 +274,7 @@ 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': 'ea9b5bbcb53e6a0c7d2a2b9745518fe56eb723e8',
+  'devtools_frontend_revision': 'e2ffb37426336eb63db537529022fadf263ebba6',
   # 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.