Index: src/wp-includes/ms-functions.php
===================================================================
--- src/wp-includes/ms-functions.php	(revision 30070)
+++ src/wp-includes/ms-functions.php	(working copy)
@@ -2474,3 +2474,14 @@
 
 	return $site_results;
 }
+
+/**
+ * Determine if the current network should be treated as a trusted network.
+ *
+ * @since 4.1.0
+ *
+ * @return bool False.
+ */
+function wp_is_trusted_network() {
+	return false;
+}
\ No newline at end of file