Commits on Sep 22, 2019

1. improve spec compliance of discarding BCs …

   do not handle compositor input events when BC is being discarded
   
   prevent firing of timers for discarded BCs
   
   return null for opener is BC has been discarded
   
   bundle discard BC steps into window method
   
   return null in window.opener, if BC has already been discarded
   
   move the window closed check pre-event to script-thread

   

   gterzian committed Sep 22, 2019

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