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This support is required for ATs on AuraLinux, so fall back instead of
triggering an assertion failure and a null position. We can remove this
workaround once sentence boundary analysis support is added to
AXPosition.

Bug: 1000049
Change-Id: I00c4eee451c75e7efe8e132d15995899eccca049
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832811Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Commit-Queue: Martin Robinson <mrobinson@igalia.com>
Cr-Commit-Position: refs/heads/master@{#714265}