Roll DevTools Frontend from 68649aff0ca8 to 22dd28af0ab7 (3 revisions)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/68649aff0ca8..22dd28af0ab7

2020-12-21 patrick.brosset@microsoft.com Flex: Draw a border around alignment arrows in the flex overlay
2020-12-21 wolfi@chromium.org Remove "blackbox" - refactor blackbox-a11y-test.js
2020-12-21 wolfi@chromium.org Remove "blackbox" - refactor TimelineFlameChartDataProvider.js

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:1152082,chromium:1157856
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: Ia965818a489ff5c411503c28693d3a70e4333b4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2599661Reviewed-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@{#838623}

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': '68649aff0ca814fc0d3a5029286cad001a859255',
+  'devtools_frontend_revision': '22dd28af0ab7a2074d73aa03b41ceb510f8a4b21',
   # 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.