diff --git a/widget/src/mac/nsIChangeManager.idl b/widget/src/mac/nsIChangeManager.idl
index b8ecbbc125e..e69de29bb2d 100644
--- a/widget/src/mac/nsIChangeManager.idl
+++ b/widget/src/mac/nsIChangeManager.idl
@@ -1,92 +0,0 @@
-/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
- *
- * ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is Mozilla Communicator.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications Corp.
- * Portions created by the Initial Developer are Copyright (C) 1999
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *   Mike Pinkerton
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
-#include "nsISupports.idl"
-#include "nsIAtom.idl"
-
-
-interface nsIContent;
-interface nsIDocument;
-
-
-//
-// nsIChangeObserver
-//
-// Something that wants to be alerted to changes in attributes or changes in
-// its corresponding content object.
-// (NOTE: If we need more things, we can add them later)
-//
-[scriptable, uuid(d8cf3bd0-1dd1-11b2-a837-fec5f865b071)]
-interface nsIChangeObserver : nsISupports
-{
-  void AttributeChanged(in nsIDocument aDocument,
-                        in long aNameSpaceID,
-                        in nsIContent aContent,
-                        in nsIAtom aAttribute);
-
-  void ContentRemoved ( in nsIDocument aDocument, in nsIContent aChild, 
-                          in long aIndexInContainer ) ;
-                          
-  void ContentInserted ( in nsIDocument aDocument, in nsIContent aChild, 
-                          in long aIndexInContainer ) ;
-  
-}; // nsIChangeObserver
-
-
-//
-// nsIChangeManager
-//
-// A central manager for registering and unregistering objects that want
-// to be notified when content objects change or children added/removed, etc.
-//
-// We use a central manager to redirect for performance reasons, to avoid
-// every meny/item from getting a call when any change to the document happens.
-//
-
-[scriptable, uuid(fb31c7e0-1dd1-11b2-8a61-f4697ef53c88)]
-interface nsIChangeManager : nsISupports
-{
-  void Register ( in nsIContent aContent, in nsIChangeObserver aMenuObject ) ;
-  void Unregister ( in nsIContent aContent ) ;
-  
-  nsIChangeObserver Lookup ( in nsIContent aContent ) ;
-  
-}; // nsPIChangeManager
-
-