Fix bug in XMLHttpRequest polyfill.
Fix bug in XMLHttpRequest polyfill.

foam-framework/foam,jlhughes/foam,foam-framework/foam,foam-framework/foam,mdittmer/foam,mdittmer/foam,jlhughes/foam,jlhughes/foam,mdittmer/foam,mdittmer/foam,foam-framework/foam,foam-framework/foam,jlhughes/foam