55     for (const auto& handler : handlers_->on_signaling_change)  in OnSignalingChange()  local
60     for (const auto& handler : handlers_->on_data_channel)  in OnDataChannel()  local
64     for (const auto& handler : handlers_->on_renegotiation_needed)  in OnRenegotiationNeeded()  local
69     for (const auto& handler : handlers_->on_standardized_ice_connection_change)  in OnStandardizedIceConnectionChange()  local
74     for (const auto& handler : handlers_->on_connection_change)  in OnConnectionChange()  local
79     for (const auto& handler : handlers_->on_ice_gathering_change)  in OnIceGatheringChange()  local
83     for (const auto& handler : handlers_->on_ice_candidate)  in OnIceCandidate()  local
91     for (const auto& handler : handlers_->on_ice_candidate_error)  in OnIceCandidateError()  local
96     for (const auto& handler : handlers_->on_ice_candidates_removed)  in OnIceCandidatesRemoved()  local
102     for (const auto& handler : handlers_->on_add_track)  in OnAddTrack()  local
107     for (const auto& handler : handlers_->on_track)  in OnTrack()  local
112     for (const auto& handler : handlers_->on_remove_track)  in OnRemoveTrack()  local