Revert of [a11y] Bring accessibility-audit up to date: v2.10.0 release.  (patchset #11 id:390001 of https://codereview.chromium.org/1447693002/ )

Reason for revert:
This looks like it might have caused a build breakage:
https://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%28dbg%29%281%29/builds/9446

Original issue's description:
> [a11y] Bring accessibility-audit up to date: v2.10.0 release.
>
> This change pulls in the latest a11y devtools release.
>
> With the update of third_party/accessibility_audit to release v2.10.0, a number of browser tests had accessibility audit failures and warnings. These are all disabled/ignored and bugs filed for each set of audit failures.
>
> The accessibility audit repository can be found at: https://github.com/GoogleChrome/accessibility-developer-tools
>
> [email protected]
> BUG=555753
>
> Committed: https://crrev.com/12fdc0a6860f25e24cca86250e8b9d0f17f3cc47
> Cr-Commit-Position: refs/heads/master@{#361792}

[email protected],[email protected],[email protected],[email protected],[email protected]
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=555753

Review URL: https://codereview.chromium.org/1481723002

Cr-Commit-Position: refs/heads/master@{#361819}
16 files changed