hmmm, I'm in Firefox with NoScript. I received no warning about trying to use my location. According to the the street view, it placed my location at city hall in downtown. I actually live about 10 miles from there.
I'm confused about the reports of showing street view without entering a location. If you deny the location permission, it won't show street view unless you explicitly type in an address. Are you sure you didn't do that? Or maybe you visited the site sometime in the past and already granted location permission?