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This reverts commit f3e4b94f.

Reason for revert: This broke tast.arc.VirtualDesks tests which makes use of the automation API to verify the window tree.

BUG=b/145555421

Original change's description:
> Avoid cycle in Accessibility tree
> 
> This is a temporary fix. By ignoring the node when it is invisible, we
> avoid navigating the cycle repeatedly. However the underlying issue
> is not addressed, and requires further investigation.
> 
> Bug: 1020733
> Change-Id: I70334259b4f271256f21dab47271f7a8346f1f7f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1919434
> Commit-Queue: Anastasia Helfinstein <anastasi@google.com>
> Reviewed-by: David Tseng <dtseng@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#717755}

TBR=dtseng@chromium.org,anastasi@google.com

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

Bug: 1020733
Change-Id: I94cbac6cc42289eee336a0dca7c85452bf7ec4ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1947638Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721165}