Display friendly message for: "Error 500: Internal Server Error. CGI program sent malformed or too big (>16384 bytes) HTTP headers"

[GoogleCodeExporter]

See 
https://code.google.com/p/phpdesktop/wiki/KnowledgeBase#Error_500:_Internal_Serv
er_Error._CGI_program_sent_malformed_or

This error message can be intercepted in CefLoadHandler::OnLoadError and 
handled appropriately by displaying a friendly error message explaining what is 
happening.

Original issue reported on code.google.com by czarek.t...@gmail.com on 15 Oct 2014 at 9:55