Roll DevTools Frontend from b917ab64e84b to 2d21a8fb4dbe (6 revisions)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/b917ab64e84b..2d21a8fb4dbe

2020-12-04 cjamcl@chromium.org Add WATCHLISTS entry for lighthouse
2020-12-04 bmeurer@chromium.org [LMI] Add support for inspecting WebAssembly.Memory objects.
2020-12-04 tvanderlippe@chromium.org Port pretty-printing layout tests to Karma
2020-12-04 kimanh@chromium.org [LMI] Show signed/unsigned values next to each other, if different
2020-12-04 tvanderlippe@chromium.org Improve formatting of do-while loop
2020-12-04 tvanderlippe@chromium.org Fix permissions for test scripts

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:1110202,chromium:1155566,chromium:983851
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: I3f64c8136baa665dfdbaafad82c370ae754d2d2f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575216Reviewed-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@{#833829}

DEPS

@@ -279,7 +279,7 @@ 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': 'b917ab64e84b7b91b925c1fc7c187e95b6602085',
+  'devtools_frontend_revision': '2d21a8fb4dbe775643ecf8fbd2ba910ca6d1ea8c',
   # 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.