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Navigation with the VO cursor should not visit hidden elements.
This had regressed because we started including hidden elements
in the accessible object hierarchy on purpose, so that when
a page accidentally overused aria-hidden, that users would
still hear something useful when tabbing to focusable items.
With this CL, users will not generally be able to accidentally
navigate to aria-hidden items, but if they manage to actually
focus one with the keyboard, it will still announce what it is.

Bug: 982408
Change-Id: I19d5fe4947e5fb1c7493f0e67d7fe8e13d9a255e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761717Reviewed-by: Alice Boxhall <aboxhall@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689677}