Optional
aInstancePtr: objectA run time mechanism for interface discovery.
NS_OK if the interface is supported by the associated instance, NS_NOINTERFACE if it is not.
aInstancePtr must not be null.
[in] A requested interface IID
[out] A pointer to an interface pointer to receive the result.
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Do not confuse with nsIDOMRTCPeerConnection. This interface is purely for communication between the PeerConnection JS DOM binding and the C++ implementation in SIPCC.
See media/webrtc/signaling/include/PeerConnectionImpl.h