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ARIA booleans that are not "false" and not explicitly undefined should be exposed as true.
ARIA object attributes that expose token should expose the error values and let the AT decide what to do with them. (This enables experimentation with new ARIA experiences, without changing the shipping browser code).

Bug: 746621
Change-Id: I91381f17db5ad179f26b02b81434b36f78492f0d
Reviewed-on: https://chromium-review.googlesource.com/584018
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491273}