Fix listener list destruction some more
Fix listener list destruction some more

svn path=/trunk/libdom/; revision=13458

dunkelstern/libdom,Achal-Aggarwal/libdom,dunkelstern/libdom,prepare/netsurf_libdom,Achal-Aggarwal/libdom,prepare/netsurf_libdom,prepare/netsurf_libdom,dunkelstern/libdom,prepare/netsurf_libdom,Achal-Aggarwal/libdom,dunkelstern/libdom,prepare/netsurf_libdom,Achal-Aggarwal/libdom,prepare/netsurf_libdom,Achal-Aggarwal/libdom,Achal-Aggarwal/libdom,dunkelstern/libdom,dunkelstern/libdom