Aaron Campbell 189e5449a3 Add nonce for widget accessibility mode.
Props vortfu.

See #23328.

Merges [39760] to 4.7 branch.

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git-svn-id: http://core.svn.wordpress.org/branches/4.7@39699 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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