By not waiting until deleteLater() kicks in it's easier to auto-test. We
can now add a test case for what happens when a shared resource is still
valid while the last context is destroyed.
Change-Id: I72963928e6a921e49ed59a79e2579b497ba37ccf
Reviewed-on: http://codereview.qt.nokia.com/3732
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@nokia.com>