wocky-http-proxy: Use GTask instead of GSimpleAsyncResult
wocky-http-proxy: Use GTask instead of GSimpleAsyncResult

Instead of using GSimpleAsyncResult, use the new GTask API, which is
much more straightforward.

Signed-off-by: Fabiano Fidêncio <2931bae082ef9bc04523ba759c03a4778316d48f@redhat.com>
Acked-by: Jonathon Jongsma <c7254805a17bd5c41e24c3a278fcbf3afcdfb0fa@redhat.com>

flexVDI/spice-gtk,fgouget/spice-gtk,fgouget/spice-gtk,SPICE/spice-gtk,SPICE/spice-gtk,flexVDI/spice-gtk,SPICE/spice-gtk,SPICE/spice-gtk,fgouget/spice-gtk