`host` property was removed in bug 1361601 on 2017-05-03 but nsDragService started to use it again after bug 396370 (from v1) on 2018-10-04. Maybe it should switch to `PR_SI_HOSTNAME`. https://searchfox.org/mozilla-central/rev/e8f334670ddf/widget/gtk/nsDragService.cpp#1462
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`host` property was removed in bug 1361601 on 2017-05-03 but nsDragService started to use it after bug 396370 (from v1) on 2018-10-04. Maybe drop or convert to `PR_SI_HOSTNAME`. https://searchfox.org/mozilla-central/rev/e8f334670ddf/widget/gtk/nsDragService.cpp#1462