Roll DevTools Frontend from 6f4e54f003dd to b90a077d51ec (7 revisions)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/6f4e54f003dd..b90a077d51ec

2021-01-11 vidorteg@microsoft.com Reducing ambiguity in some strings
2021-01-11 morlovich@chromium.org Custom UA-CH emulation: initial integration test
2021-01-11 janscheffler@chromium.org Revert "[JSDOC2TS]: Migrate webauthn"
2021-01-11 tvanderlippe@chromium.org Move assertNotNull into platform
2021-01-11 janscheffler@chromium.org [JSDOC2TS]: Migrate webauthn
2021-01-11 jacktfranklin@chromium.org [Dark mode] replace #fff background-color
2021-01-11 altimin@chromium.org [devtools] Remove timeline flow event experiment.

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:1073909,chromium:1136655,chromium:1152736,chromium:1158760,chromium:1164298
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: Ie45a76f65bfc24c7623c57b6ed47f4f2475c18c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622830Reviewed-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@{#842181}

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': '6f4e54f003dd3094626dd026fbb4c4fcbb7b52d6',
+  'devtools_frontend_revision': 'b90a077d51ec0f1e13d69aafa1f356b39aa3fcf8',
   # 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.