Manage upstream removal of nsILocalFile
Manage upstream removal of nsILocalFile

It was removed recently in Nightly 57:
  https://bugzilla.mozilla.org/show_bug.cgi?id=1375125

I'm not sure why I didn't use nsIFile in the first place, as both
interfaces were merged years ago:
  https://bugzilla.mozilla.org/show_bug.cgi?id=682360

nohamelin/xseei