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The Fuchsia Semantics API changed, so this change converts the new added
roles.

Note that this change is not converting the added roles related to
lists, which will be solved in a future change.

Test: AXTreeConverterTest.ConvertRoles
Bug: fuchsia:60180,1136536
Change-Id: I23e8b0dc02e2e9f85cae16be81c400744831905a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2461954
Commit-Queue: Lucas Radaelli <lucasradaelli@google.com>
Reviewed-by: Sharon Yang <yangsharon@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816302}