cast nsCString as a const char *.

mailnews/base/src/nsMsgNotificationManager.cpp

@@ -241,7 +241,7 @@ nsresult nsMsgNotificationManager::AddNewMailNotification(nsIMsgFolder *folder)
 
 
 	nsCOMPtr<nsIRDFResource> notificationResource;
-	rv = rdfService->GetResource(newMailURI, getter_AddRefs(notificationResource));
+	rv = rdfService->GetResource((const char *) newMailURI, getter_AddRefs(notificationResource));
 	if(NS_FAILED(rv))
 		return rv;