GitLab

This reverts commit cf071719.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 612160 as the
culprit for flakes in the build cycles as shown on:
https://findit-for-me.appspot.com/waterfall/flake/flake-culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyQwsSDEZsYWtlQ3VscHJpdCIxY2hyb21pdW0vY2YwNzE3MTk1ZWQ1Nzk4YzE5NzBmNDg5NzY4MmExNTE3YzIyOWU3NQw

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.linux/linux-xenial-rel/5253

Sample Failed Step: network_service_content_browsertests on Ubuntu-16.04

Sample Flaky Test: DumpAccessibilityTreeTest.AccessibilityVideoControls

Original change's description:
> [Accessibility] Volume slider reads out level in percentages.
> 
> This CL makes it such that the volume level is read out as a percentage
> in aria. This CL also amplifies how the accessibility information is
> given to aria, by setting attributes instead of explicitly creating
> accessibility nodes.
> 
> Bug: 905024
> Change-Id: I0ee5a91215669f39c7394d3c8f113ae83a74cf00
> Reviewed-on: https://chromium-review.googlesource.com/c/1337298
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
> Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
> Commit-Queue: CJ DiMeglio <lethalantidote@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#612160}

Change-Id: I06f47bd929725e2176c9cc9a48e20993d1cb78f9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 905024, 910123
Reviewed-on: https://chromium-review.googlesource.com/c/1354196
Cr-Commit-Position: refs/heads/master@{#612184}