Revert "mshtml: Use QueryService to get IHttpNegotiate in get_post_data_stream."

[Jacek Caban]

Vitaliy Margolen wrote:
> Yes it does fix the problem. Thank you. So then something inserts extra 
> empty line(s) between header and the body? No wonder proxy doesn't like this 
> - it is an equivalent of an empty reply.
>   
Gecko reported in header content with length 0 (because of this empty 
line) and it caused problem for proxy. I've sent a patch to wine-patches.

Jacek