Gary Pendergast 6f9a887644 Editor: Remove unwanted fields before saving posts.
The `meta_input`, `file`, and `guid` fields are not intended to be updated through user input.

Merges [44047] to the 4.7 branch.


Built from https://develop.svn.wordpress.org/branches/4.7@44056


git-svn-id: http://core.svn.wordpress.org/branches/4.7@43886 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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