Removed directrender/pageflipper codepaths.

Change-Id: I770b79eb21fbc4ac7826cec5c47286dab6c74da5
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
Reviewed-by: Andy Nichols <andy.nichols@digia.com>