diff --git a/content/xml/document/public/nsIXMLDocument.h b/content/xml/document/public/nsIXMLDocument.h
deleted file mode 100644
index 6c302a01493c..000000000000
--- a/content/xml/document/public/nsIXMLDocument.h
+++ /dev/null
@@ -1,62 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* ***** BEGIN LICENSE BLOCK *****
- * Version: NPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Netscape 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/NPL/
- *
- * 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 client code.
- *
- * The Initial Developer of the Original Code is 
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 1998
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *
- *
- * 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 NPL, 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 NPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
-#ifndef nsIXMLDocument_h___
-#define nsIXMLDocument_h___
-
-#include "nsISupports.h"
-class nsIURI;
-
-#define NS_IXMLDOCUMENT_IID \
- { 0xa6cf90ca, 0x15b3, 0x11d2, \
- { 0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32 } }
-
-#define NS_STYLESHEET_FROM_CATALOG 0x1
-
-/**
- * XML document extensions to nsIDocument
- */
-class nsIXMLDocument : public nsISupports
-{
-public:
-  NS_DEFINE_STATIC_IID_ACCESSOR(NS_IXMLDOCUMENT_IID)
-
-  NS_IMETHOD SetDefaultStylesheets(nsIURI* aUrl)=0;
-};
-
-#endif // nsIXMLDocument_h___