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Removing the role check for aria-activedescendant support simplifies the
code and decreases differences with Firefox.

Bug: None
Change-Id: Ie497d29434344152d1e51d27a9301e31e332b1d9
Reviewed-on: https://chromium-review.googlesource.com/1213539Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590294}