Roll DevTools Frontend from 23c845754ce8 to 42f585a5ad09 (3 revisions)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/23c845754ce8..42f585a5ad09

2020-06-19 mathias@chromium.org Fix `-theme-preserve` styles
2020-06-19 yangguo@chromium.org Allow COMMON_OWNERS to review BUILD.gn
2020-06-19 devtools-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com Update DevTools DEPS.

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:1083142
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: I80b8f2fdf3aae38a0a7c20c1f2e27d1f97e5dab8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2253897Reviewed-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@{#780324}

DEPS

@@ -253,7 +253,7 @@ 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': '23c845754ce814954336b512a73c7be2d88a621c',
+  'devtools_frontend_revision': '42f585a5ad097d6e29e05c19628cf96df00ebf25',
   # 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.