Roll src/third_party/devtools-frontend/src 4c0a21a0882d..b1bd631c010d (2 commits)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/4c0a21a0882d..b1bd631c010d

git log 4c0a21a0882d..b1bd631c010d --date=short --first-parent --format='%ad %ae %s'
2020-04-15 michael.liao@microsoft.com [Accessibility Pane]: Collapse accessibility node on click
2020-04-15 michael.liao@microsoft.com [TabbedPane]: Fix focus bug where the placeholder view would steal keyboard focus upon setting

Created with:
  gclient setdep -r src/third_party/devtools-frontend/src@b1bd631c010d

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:1045349,chromium:1070731
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: I2710815786b9ea46e88223923998605d49cae401
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2151631Reviewed-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@{#759492}

DEPS

@@ -246,7 +246,7 @@ 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': '4c0a21a0882d117c4c58c2a3807c75fed748ae43',
+  'devtools_frontend_revision': 'b1bd631c010dc315f8fc38b9e5802c7e912a0b01',
   # 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.