Jeremy Felt ff58a699f0 Media: Improve verification of MIME file types.
Merges [43988] to the 4.9 branch.


git-svn-id: https://develop.svn.wordpress.org/branches/4.9@43989 602fd350-edb4-49c9-b593-d223f7449a82
2018-12-12 23:02:11 +00:00
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