Okay, adding bitcoin to the spelling dictionary is not what's going to do anything. It will be added once bitcoin is considered a legitimate word by enough people.
This is like complaining that a Google search is bringing up what most people expect it to bring up but a small minority of people disagree with the results. While we're at it lets get them to add crypto-anarchists and [insert archaic/net-yet-well-known term here]...
Not really the same thing. I would assume that there is some default dictionary that comes with Google chrome? All we would need is for somebody to add "bitcoin" to the default dictionary and then it would be fixed for everybody. Not really the same as doing a websearch. Unless Google chrome is somehow searching the web to decide weather a word is spelled wrong? Seeing how people actually spell things on the web would be a disaster, have you seen how people spell things on any comments around the web?