Revert [34917] until the broken test is fixed.

See #13382

Built from https://develop.svn.wordpress.org/trunk@34925


git-svn-id: http://core.svn.wordpress.org/trunk@34890 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/revision.php

@@ -54,7 +54,7 @@ function wp_get_revision_ui_diff( $post, $compare_from, $compare_to ) {
 
 	$return = array();
 
-	foreach ( _wp_post_revision_fields( $post ) as $field => $name ) {
+	foreach ( _wp_post_revision_fields() as $field => $name ) {
 		/**
 		 * Contextually filter a post revision field.
 		 *