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Currently, ChromeVox Next uses the programmatic string when whenever $role gets used. This cl makes it so $role resolves to a msg id, if one exists. Additionally, the role info object also lists the arcon associated with that role.

This allows us to remove a few of the output rules (button, textField).

Review URL: https://codereview.chromium.org/1011913002

Cr-Commit-Position: refs/heads/master@{#322423}