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Reading of views is now handled using ChromeVox Next with the automation API. The current Next background page fails on non-CROS because there's no commands block. We get an error like
getAll called on undefined.

(chrome.commands is undefined).

TEST=manually build ChromeVox; verify views reads properly.

Review URL: https://codereview.chromium.org/1138773006

Cr-Commit-Position: refs/heads/master@{#330249}