void UnregisterDeviceByChannelType ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & LocalUserId, const [FString](API\Runtime\Core\Containers\FString) & InstanceId, const [FString](API\Runtime\Core\Containers\FString) & ChannelType, const [FOnUnregisterDeviceByChannelTypeComplete](API\Plugins\OnlineSubsystem\Interfaces\FOnUnregisterDeviceByChannelType-) & Delegate )