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Mats Palmgren authored
mObservers is a nsTObserverArray which is infallible, so no need to check the return value from AppendElementUnlessExists (which a later patch in this series will remove).
e608cdac
mObservers is a nsTObserverArray which is infallible, so no need to check the return value from AppendElementUnlessExists (which a later patch in this series will remove).