WP_Customize_Theme_Control::content_template()
Props itowhid06. Merges [43166] to the 4.9 branch. Fixes #43945. Built from https://develop.svn.wordpress.org/branches/4.9@43167 git-svn-id: http://core.svn.wordpress.org/branches/4.9@42996 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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