Aaron Campbell 0f8124cdc6 Add nonce for widget accessibility mode.
Props vortfu.

See #23328.

Merges [39765] to 4.0 branch.

Built from https://develop.svn.wordpress.org/branches/4.0@39768


git-svn-id: http://core.svn.wordpress.org/branches/4.0@39706 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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