Helen Hou-Sandí e0b55f4a75 Update $_old_files for 5.6.
See #39943.
Merges [49774] to the 5.6 branch.

Built from https://develop.svn.wordpress.org/branches/5.6@49775


git-svn-id: http://core.svn.wordpress.org/branches/5.6@49498 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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