More specific error codes in the core upgrader when copying language, plugin, and theme files. see #22704.


git-svn-id: https://develop.svn.wordpress.org/trunk@25772 602fd350-edb4-49c9-b593-d223f7449a82
3.7-beta2-25773


git-svn-id: https://develop.svn.wordpress.org/trunk@25773 602fd350-edb4-49c9-b593-d223f7449a82