It's a bit confusing -- it's because FARR doesn't know that you are telling it commandline parameters. Perhaps it should be smart enough to figure that out..
The workaround is the explicit method of specifying commandline parameters, from the help file topic on "Passing commandline parameters..":
You can now pass commandline arguments to any launched program by typing "++ any args here" at the end of your search string.
ping.exe ++ donationcoder.com -n 2
So in your case:
The easier solution if you are doing this kind of thing quite a bit might be to create an alias that knows that when you type
chrome [ANYTHING HERE]
It knows you want to launch chrome.exe with the url passed.
This would have the advantage of being instant and not requiring any searching.