Quick fix to bug 264106 suggested by mattwillis

Crash on launch: chrome://browser/content/hiddenWindow.xul can't be resolved

calendar/sunbird/app/profile/sunbird.js

@@ -42,7 +42,7 @@
 pref("general.startup.calendar", true);
 
 pref("browser.chromeURL","chrome://calendar/content/");
-pref("browser.hiddenWindowChromeURL", "chrome://browser/content/hiddenWindow.xul");
+pref("browser.hiddenWindowChromeURL", "chrome://calendar/content/hiddenWindow.xul");
 pref("xpinstall.dialog.confirm", "chrome://mozapps/content/xpinstall/xpinstallConfirm.xul");
 pref("xpinstall.dialog.progress", "chrome://mozapps/content/downloads/downloads.xul");
 pref("xpinstall.dialog.progress.type", "Download:Manager");

calendar/sunbird/base/content/hiddenWindow.xul

@@ -0,0 +1,31 @@
+<?xml version="1.0"?>
+# -*- Mode: HTML -*-
+#
+# 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, released
+# March 31, 1998.
+#
+# The Initial Developer of the Original Code is Netscape
+# Communications Corporation. Portions created by Netscape are
+# Copyright (C) 1998-2000 Netscape Communications Corporation. All
+# Rights Reserved.
+#
+# Contributor(s):
+#   David Hyatt <hyatt@mozilla.org> (Original Author)
+#
+#ifdef XP_MACOSX
+<window id="main-window"
+        xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+</window>
+
+#endif

calendar/sunbird/base/jar.mn

@@ -2,3 +2,4 @@ calendar.jar:
 +  content/calendar/calendar.xul                 (content/calendar.xul)
 +  content/calendar/menuOverlay.xul              (content/menuOverlay.xul)
 *  content/calendar/customizeToolbar.xul         (content/customizeToolbar.xul)
+*  content/browser/hiddenWindow.xul              (content/hiddenWindow.xul)