Modify IE XOrigin code to not choose this option when user specified additional headers, since this won't work.
Modify IE XOrigin code to not choose this option when user specified additional headers, since this won't work.

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@palm.com)

wikieswan/enyo,mcanthony/enyo,enyojs/enyo,mcanthony/enyo,bright-sparks/enyo,PKRoma/enyo,enyojs/enyo,kustomzone/enyo,soapdog/enyo,zefsolutions/enyo,PKRoma/enyo,onecrayon/enyo,airspringsoftware/enyo,zefsolutions/enyo,beni55/enyo,kustomzone/enyo,onecrayon/enyo,beni55/enyo,soapdog/enyo,airspringsoftware/enyo,wikieswan/enyo,bright-sparks/enyo