Mostly style cleanup re: GM_xhr referer.
Mostly style cleanup re: GM_xhr referer.

Fixes #1240

HasClass0/greasemonkey,HasClass0/greasemonkey,Martii/greasemonkey,the8472/greasemonkey,Ventero/greasemonkey,Ventero/greasemonkey,Martii/greasemonkey,the8472/greasemonkey