Index: src/wp-includes/class-wp-editor.php
===================================================================
--- src/wp-includes/class-wp-editor.php	(revision 43326)
+++ src/wp-includes/class-wp-editor.php	(working copy)
@@ -515,7 +515,6 @@
 							}
 
 							$ext_plugins .= 'tinyMCEPreInit.load_ext("' . $plugurl . '", "' . $mce_locale . '");' . "\n";
-							$ext_plugins .= 'tinymce.PluginManager.load("' . $name . '", "' . $url . '");' . "\n";
 						}
 					}
 				}