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Radio buttons, switches, and check boxes should always be visited during all types of navigation.

The one corner case here is if there are clickable descendants for the node;
this can occur only if an author creates a complex subtree for the node.

R=dmazzoni@chromium.org

Test: browser_tests --gtest_filter=ChromeVox*.AriaRadios
Change-Id: I6306404f8a303164f4af4a9e3f4b5bde3a261502
Fixed: 1136253
AX-Relnotes: makes ChromeVox output aria radio buttons that don't receive focus.
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2468076
Commit-Queue: David Tseng <dtseng@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817049}