Roll DevTools Frontend from 89a7ef9f2dd9 to d3e40e9e1f3d (7 revisions)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/89a7ef9f2dd9..d3e40e9e1f3d

2020-10-02 devtools-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com Update DevTools DEPS.
2020-10-02 changhaohan@chromium.org Clean up unused treeElementSymbol
2020-10-02 jacktfranklin@chromium.org Fix heap snapshot test flakes on Mac bots
2020-10-02 jacktfranklin@chromium.org Add `component_docs/README.md`
2020-10-02 jobay@google.com Typecheck quick_open/QuickPick.js with TypeScript
2020-10-02 tvanderlippe@chromium.org Remove Node.prototype.appendChildren
2020-10-02 jacktfranklin@chromium.org Component docs server only lists HTML files

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:1050549
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: Ia4febe404810d9e1c91276c4ff102d12a9c64ff9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2445710Reviewed-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@{#813192}

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': '89a7ef9f2dd9f70c77335e6c68c2977fd11b99d9',
+  'devtools_frontend_revision': 'd3e40e9e1f3d522fef12341f06478b4baad0253e',
   # 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.