Roll src/third_party/devtools-frontend/src 48c9ef678756..227ae8212a3d (3 commits)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/48c9ef678756..227ae8212a3d

git log 48c9ef678756..227ae8212a3d --date=short --first-parent --format='%ad %ae %s'
2019-12-02 janscheffler@chromium.org Add warnings for manifest icons
2019-12-02 janscheffler@chromium.org Add a preview to svg image elements
2019-12-02 aerotwist@chromium.org Adds license checker

Created with:
  gclient setdep -r src/third_party/devtools-frontend/src@227ae8212a3d

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: None
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: Ie37d2d377ec8847df8c73e68f0dd8f0fe4277cda
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1946143Reviewed-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@{#720478}

DEPS

@@ -243,7 +243,7 @@ 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': '48c9ef678756730eb4ea3dd92d13fadf3b665beb',
+  'devtools_frontend_revision': '227ae8212a3db4e0151d53e3393b9cf0038fbbb4',
   # 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.