find a better way to include startup javascript about chromeless

[taboca]

One other angle to see this is not in the programatically versus declaratively. We could offer a declarative initial start point, but I do think, one other related aspect is that, with the main.xul we were launching an initial window and asking XULRunner to launch a window, via the preference:

pref("toolkit.defaultChromeURI", "chrome://chromeless/content/main.xul");

The issue is solved now due to Lloyd's patch db57ae5 which relates to bugzilla Atuls' patch
https://bugzilla.mozilla.org/show_bug.cgi?id=593493

Thanks Lloyd and Atul

[taboca]

Additional benefit of the above patch is that we can remove the, now unecessary, pref line cada105