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Also, I fixed two issues in a11y page:
1. settings. -> settings.settings. (b/c the names were already prefixed with "settings.")
2. Correctly concat the list of prefs to request via chrome.send()  (this will go away later anyway when we switch to settingsPrivate API.)

BUG=464898

Review URL: https://codereview.chromium.org/990473002

Cr-Commit-Position: refs/heads/master@{#324163}