Bug #30157 --> add the ability to launch urls using OS default protocol handlers. (NOT PART OF THE BUILD)

code review will come when this is done and gets turned on.

New file. This file replaces nsCExternalHelperApp.idl. It includes both protocol and helper app service progid information.

uriloader/exthandler/nsCExternalHandlerService.idl

@@ -0,0 +1,43 @@
+/* -*- Mode: IDL; tab-width: 3; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * 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 the Mozilla browser.
+ * 
+ * The Initial Developer of the Original Code is Netscape
+ * Communications, Inc.  Portions created by Netscape are
+ * Copyright (C) 1999, Mozilla.  All Rights Reserved.
+ * 
+ * Contributor(s):
+ *   Scott MacGregor <mscott@netscape.com>
+ */
+
+#include "nsIExternalHelperAppService.idl"
+
+/*
+nsCExternalHelperApp implements:
+-------------------------
+nsIExternalHelperAppService
+*/
+
+%{ C++
+
+/* A7F800E0-4306-11d4-98D0-001083010E9B */
+#define NS_EXTERNALHELPERAPPSERVICE_CID   \
+ { 0xa7f800e0, 0x4306, 0x11d4, { 0x98, 0xd0, 0x0, 0x10, 0x83, 0x1, 0xe, 0x9b } }
+
+#define NS_EXTERNALHELPERAPPSERVICE_PROGID \
+"component://netscape/uriloader/external-helper-app-service"
+
+#define NS_EXTERNALPROTOCOLSERVICE_PROGID \
+"component://netscape/uriloader/external-protocol-service"
+
+%}