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If the role logic needs to be overridden, do it via
DetermineAccessibilityRole() or Init(). Do not allow RoleValue() to be
overridden, as the role must no vary during the lifetime of an object.

Bug: None
Change-Id: I14bda422895924f495be13e67de1a598ccbebeb7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2598621
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838756}