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These old webui tests don't currently run, and are being
replaced with a new system based on axe-core.
https://www.chromium.org/developers/accessibility/testing/axe-core

There will be additional cleanup to fully removed axs_testing.js.
See crbug.com/807458.

Bug: None
Change-Id: If2bfb17550fb762272173a40f572c3301c40aa4a
Reviewed-on: https://chromium-review.googlesource.com/894146Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Alice Boxhall <aboxhall@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533148}