It was introduced, because `Navigation.go` perserved hash fragments. We
actually don't need that behaviour and it has been corrected.
`goWithoutHashFragments` also didn't deal with absolute URLs. And it used
`location.origin` which is not supported by Internet Explorer. That is
fixed by our use of Modernizr though.
I looked through the history and it looks like this function was a bit
flawed (preserving hash fragments) from the beginning. It has been
patched a few times without addressing the underlying issue that we want
more than just replacing the pathname. We want to go somewhere else.
