also includes fixes for bugs:
#383672: after visiting http://cheese.livejournal.com/, typing livejournal in the urlbar should suggest http://cheese.livejournal.com/#392141: strip trailing / leading whitespace before doing url bar autocomplete
#391887: typing "https://" no longer drops down a list of https sites
#390404: javascript: urls (and other urls) that I didn't type or click on are in url bar when I autocomplete
#385033: URLBar dropdown hangs and eats keystrokes when typing
#373256: URL/location bar autocomplete slowness (sqlite database doesn't seem to be cached)
r=dietrich
db280a0e7e