Revert "Roll DevTools Frontend from 270e6f332c41 to edad8321ca15 (4 revisions)"

This reverts commit d0b5f5ca.

Reason for revert: likely the culprit for compile failure (https://ci.chromium.org/p/chromium/builders/ci/win-archive-rel/15899?)

Original change's description:
> Roll DevTools Frontend from 270e6f332c41 to edad8321ca15 (4 revisions)
> 
> https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/270e6f332c41..edad8321ca15
> 
> 2020-07-20 pfaffe@chromium.org [wasm debug] Add an API for Language Plugins Extensions
> 2020-07-20 jacktfranklin@chromium.org Migrate `front_end/bindings` to `devtools_entrypoint`
> 2020-07-20 alexrudenko@chromium.org Add showTrackSizes to the grid overlay
> 2020-07-20 petermarshall@chromium.org tests: Always specify a timeout for waitFor/Function
> 
> 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:1083146,chromium:1101738,chromium:1105808
> Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
> Change-Id: Ifb947b680923d8f750a5d3d8ef575c47d70334d7
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2307350
> Reviewed-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@{#789900}

TBR=chromium-autoroll@skia-public.iam.gserviceaccount.com,devtools-waterfall-sheriff-onduty@grotations.appspotmail.com

Change-Id: I7687a2d49c07b3020bb897e1d324c0f80b2b1c1f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:1083146
Bug: chromium:1101738
Bug: chromium:1105808
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2306045Reviewed-by: Maksim Moskvitin <mmoskvitin@google.com>
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Cr-Commit-Position: refs/heads/master@{#789906}

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': 'edad8321ca15eb80dbde5be4874e3cefd60dd15c',
+  'devtools_frontend_revision': '270e6f332c4179801c60551c828c07c69104e594',
   # 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.