Remove the remaining v8 usage from the xmlhttprequest implementation

Change-Id: Id1b9e125627a1289e8e855be3ac594139f21cf0c
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
Finally get rid of qv8objectresource

Change-Id: I3f157148a71cc2f36e51eb8007bfb03cfb5d08af
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
Remove some more v8 leftovers

Change-Id: Ie025cf45444bdf42936c588997c2baa3b0d4fd05
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>