Fix linking error: error

undefined reference to 'mozilla::dom::fmradio::FMRadioChild::cycleCollection::UnlinkImpl(void*)'

undefined reference to
'mozilla::dom::fmradio::FMRadioChild::cycleCollection::TraverseImpl(mozilla::dom::fmradio::FMRadioChild::cycleCollection*,
void*, nsCycleCollectionTraversalCallback&)'