Roll src/third_party/devtools-frontend/src a4e536a0953d..3aa0411a4cb6 (2 commits)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/a4e536a0953d..3aa0411a4cb6

git log a4e536a0953d..3aa0411a4cb6 --date=short --first-parent --format='%ad %ae %s'
2020-01-09 liviurau@chromium.org Whitespace to trigger builders
2020-01-09 sigurds@chromium.org [network] Change signature of empty protocol message handler

Created with:
  gclient setdep -r src/third_party/devtools-frontend/src@3aa0411a4cb6

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:1032063
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: If21fb5bcf68210cebc62a0702d584dea613cf9fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1993269Reviewed-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@{#729730}

DEPS

@@ -252,7 +252,7 @@ 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': 'a4e536a0953df01d14c451edb2d63cb35bd7bf09',
+  'devtools_frontend_revision': '3aa0411a4cb6ace7627f4edc478d5af6221eeab0',
   # 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.