Assert shell and all windows are destroyed
This will cause Epiphany to crash if we accidentally leak any EphyWindow or the EphyShell, to help us notice if we ever reintroduce #2130 (closed).
Fixes #2170 (closed)
This will cause Epiphany to crash if we accidentally leak any EphyWindow or the EphyShell, to help us notice if we ever reintroduce #2130 (closed).
Fixes #2170 (closed)