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AXSelection::Select has logic meant to handle selection within an native
text field. But when the selection is being set, the base and extent may
be the static text descendant of the AXObject associated with the field.
In this instance, the logic for text fields is not being used.

Fix this by retrieving the native text control ancestor AXObject. Then,
to ensure there is no behavior change, set focus on the element after
the selection range was successfully set.

Bug: 1113650

AX-Relnotes: N/A
Change-Id: I5b1db3dcf7d01baf971d5858c936a4e5d168543e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352898
Commit-Queue: Joanmarie Diggs <jdiggs@igalia.com>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800297}