Index: wp-includes/js/tinymce/tiny_mce_popup.js
===================================================================
--- wp-includes/js/tinymce/tiny_mce_popup.js	(revision 40771)
+++ wp-includes/js/tinymce/tiny_mce_popup.js	(working copy)
@@ -53,7 +53,7 @@
     }
 
     // Setup local DOM
-    self.dom = self.editor.windowManager.createInstance('tinymce.plugins.dom.DOMUtils', document, {
+    self.dom = self.editor.windowManager.createInstance('tinymce.dom.DOMUtils', document, {
       ownEvents: true,
       proxy: tinyMCEPopup._eventProxy
     });
Index: wp-includes/js/tinymce/utils/mctabs.js
===================================================================
--- wp-includes/js/tinymce/utils/mctabs.js	(revision 40771)
+++ wp-includes/js/tinymce/utils/mctabs.js	(working copy)
@@ -12,7 +12,7 @@
 
 function MCTabs() {
   this.settings = [];
-  this.onChange = tinyMCEPopup.editor.windowManager.createInstance('tinymce.plugins.util.Dispatcher');
+  this.onChange = tinyMCEPopup.editor.windowManager.createInstance('tinymce.util.Dispatcher');
 }
 
 MCTabs.prototype.init = function (settings) {