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diff --git a/src/libs/xpcom18a4/xpcom/ds/nsObserverService.h b/src/libs/xpcom18a4/xpcom/ds/nsObserverService.h
new file mode 100644
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+++ b/src/libs/xpcom18a4/xpcom/ds/nsObserverService.h
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+/* -*- Mode: C++; 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.org 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 of 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 ***** */
+
+#ifndef nsObserverService_h___
+#define nsObserverService_h___
+
+#include "nsIObserverService.h"
+
+#define NS_OBSERVERSERVICE_CONTRACTID "@mozilla.org/observer-service;1"
+#define NS_OBSERVERSERVICE_CLASSNAME "Observer Service"
+
+class nsObserverList;
+class nsObjectHashtable;
+
+// {D07F5195-E3D1-11d2-8ACD-00105A1B8860}
+#define NS_OBSERVERSERVICE_CID \
+    { 0xd07f5195, 0xe3d1, 0x11d2, { 0x8a, 0xcd, 0x0, 0x10, 0x5a, 0x1b, 0x88, 0x60 } }
+
+class nsObserverService : public nsIObserverService {
+public:
+  NS_DEFINE_STATIC_CID_ACCESSOR( NS_OBSERVERSERVICE_CID )
+
+  nsObserverService();
+     
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIOBSERVERSERVICE
+  
+  static NS_METHOD
+  Create(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr);
+
+private:
+  ~nsObserverService(void);
+
+  nsObjectHashtable* mObserverTopicTable;
+
+  nsresult GetObserverList(const char* aTopic, nsObserverList** anObserverList);
+
+
+};
+
+#endif /* nsObserverService_h___ */