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This change fixes a bug where an invisible AxNode was being remapped to
a hidden Fuchsia node, where an ignored AxNode actually matches the
expected behavior.

Documentation for invisible:
https://chromium.googlesource.com/chromium/src/+/lkgr/docs/accessibility/offscreen.md

Test: AXTreeConverterTest.*
Bug: 1135817,fuchsia:60693
Change-Id: Ice78a489a16d4edd357a9181d7bf3d23a32ffb28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454092Reviewed-by: Sharon Yang <yangsharon@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Lucas Radaelli <lucasradaelli@google.com>
Cr-Commit-Position: refs/heads/master@{#814514}