GitLab

This reverts commit 3c0f2556.

Reason for revert: test is extremely flaky

Per https://analysis.chromium.org/p/chromium/flake-portal/flakes/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVyUgsSBUZsYWtlIkdjaHJvbWl1bUBicm93c2VyX3Rlc3RzQERldlRvb2xzRXh0ZW5zaW9uVGVzdC5UZXN0RXZhbHVhdGVPbkNocm9tZVNjaGVtZQw this flakily fails about 10 times an hour.

Original change's description:
> DevTools: add tests for extensions on DOM UI pages
> 
> This is the chrome-side counterpart of
> https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2128732
> 
> Bug: 1059577, 795595
> Change-Id: Iec2ee772a42b4c7bc2249627c0839f7506f0cd1d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129344
> Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
> Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
> Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#756375}

TBR=dgozman@chromium.org,rdevlin.cronin@chromium.org,caseq@chromium.org,bmeurer@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1059577, 795595
Change-Id: I2919088167b064086b315d8c3a64df569d95c844
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2188512Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#766575}