Roll DevTools Frontend from 8b068ffba19b to 28ecfe40d6ae (3 revisions)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/8b068ffba19b..28ecfe40d6ae

2020-09-15 aerotwist@chromium.org [TS] TypeScriptify HeapSnapshotModel
2020-09-15 adithyas@chromium.org Portals: Fix isTopFrame logic
2020-09-15 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:1011811,chromium:1127046
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: Iea328be026f6019173152302485bcb4f61d1e48b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412272Reviewed-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@{#807037}

DEPS

@@ -266,7 +266,7 @@ 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': '8b068ffba19b816885244542b7a87cbbb0317950',
+  'devtools_frontend_revision': '28ecfe40d6aedcf55935154dcbe0f63e7e63147f',
   # 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.