Sergey Biryukov 94aa7baeb2 Escape the output in wp_ajax_upload_attachment().
Merges [45936] to the 4.9 branch.
Props whyisjake, sstoqnov.
Built from https://develop.svn.wordpress.org/branches/4.9@45943


git-svn-id: http://core.svn.wordpress.org/branches/4.9@45754 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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