wininet: Don't assume that end of chunk means end of stream.

[Hans Leidekker]

On Wed, 2013-09-11 at 17:53 +0200, Jacek Caban wrote:
> > Network traces tell me that native also performs a read on the first call to
> > InternetQueryDataAvailable.
>
> Are you sure it's not an asynchronous read from a separated thread that
> is ordered by InternetQueryDataAvailable if no data is available?

This was a synchronous request.