Reviewed by Kenneth Rohde Christiansen.

        [Qt] Wrong runtime instance objects of wrapped QObjects may be used if
        the wrapped object died before the gc removed the instance.

        https://bugs.webkit.org/show_bug.cgi?id=31681

        Before using a cached instance, verify that its wrapped QObject is
        still alive.

        * bridge/qt/qt_instance.cpp:
        (JSC::Bindings::QtInstance::getQtInstance):
        * bridge/qt/qt_instance.h:
        (JSC::Bindings::QtInstance::hashKey):
2009-11-23  Simon Hausmann  <simon.hausmann@nokia.com>

        Reviewed by Kenneth Rohde Christiansen.

        [Qt] Wrong runtime instance objects of wrapped QObjects may be used if
        the wrapped object died before the gc removed the instance.

        https://bugs.webkit.org/show_bug.cgi?id=31681

        Added a unit-test to verify that wrapping a QObject with the
        same identity as a previously but now dead object works.

        * tests/qwebframe/tst_qwebframe.cpp:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@51306 268f45cc-cd09-0410-ab3c-d52691b4dbfc