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On an AXObject these would always return their default value, as they
need a Node to get an Element to get the attribute.

AX-Relnotes: n/a.
Change-Id: Icb4a430a695e58fe70c7d7be1f6fc896ca38dc90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2520479Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Alice Boxhall <aboxhall@chromium.org>
Commit-Queue: Chris Hall <chrishall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824710}