Note that when SimplePie is used through the WordPress fetch_feed() function, we use kses rather than SimplePie_Sanitize, which removes the dependency on DOMDocument. This change is only for plugins using SimplePie directly.
props rmccue. fixes#21990.
git-svn-id: https://develop.svn.wordpress.org/trunk@22970 602fd350-edb4-49c9-b593-d223f7449a82
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