[WIP] Remove unused/broken GM_BrowserUI observer
[WIP] Remove unused/broken GM_BrowserUI observer

Since GM_BrowserUI is a function, the observer service calls it
directly instead of GM_BrowserUI.observe.

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