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This reverts commit 6ba01b3d.

Reason for revert: crbug.com/1055393

Original change's description:
> Extend AXLiveRegionTracker to generate live region change text.
>
> When a live region changes, optionally provide a way to generate the
> text associated with that change. On some platforms we might expose
> that text directly so that AT doesn't need to try to compute it.
>
> The computation is somewhat subtle because it involves worrying about
> deleted nodes and handling aria-atomic, aria-relevant, and aria-busy.
>
> Bug: 1042893
> Change-Id: Ia79f0c976bef73ea25a8821dbb9fc7f22fde0e3c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2006131
> Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
> Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
> Cr-Commit-Position: refs/heads/master@{#738876}

TBR=dmazzoni@chromium.org,nektar@chromium.org,kbabbitt@microsoft.com

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

Bug: 1042893
Tbr: kbabbitt@microsoft.com
Change-Id: I06bcc90d0597c649831b65e09151bfb756b22fbe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2071785
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744200}