Bug 561061 - qt fennec crashes on close. r=dougt.

dom/ipc/TabChild.cpp

@@ -378,9 +378,6 @@ TabChild::~TabChild()
         JS_DestroyContext(mCx);
       }
     }
-#ifdef MOZ_WIDGET_QT
-    nsQAppInstance::Release();
-#endif
 }
 
 NS_IMETHODIMP

widget/src/qt/nsAppShell.cpp

@@ -45,6 +45,7 @@
 #include <qabstracteventdispatcher.h>
 
 #include "prenv.h"
+#include "nsQAppInstance.h"
 
 #ifdef MOZ_LOGGING
 #define FORCE_PR_LOG
@@ -62,6 +63,7 @@ static int sPokeEvent;
 
 nsAppShell::~nsAppShell()
 {
+    nsQAppInstance::Release();
 }
 
 nsresult