void DestroyExistingSession_Impl ( [FDelegateHandle](API\Runtime\Core\Delegates\FDelegateHandle) & OutResult, [FName](API\Runtime\Core\UObject\FName) SessionName, [FOnDestroySessionCompleteDelegate](API\Plugins\OnlineSubsystem\Interfaces\FOnDestroySessionCompleteDelegat-) & Delegate )