Does Unity 2017 still need GameId in My C# Code?

As Title,I Get a Unity Ads Demo, But I can't find GameId in the code,So it means GameId is not nessary in Unity 2017 ? Because It successful show the AD.Thank you!!!

using UnityEngine;
using System.Collections;
using UnityEngine.Advertisements;
using UnityEngine.UI;
public class show_ad : MonoBehaviour
{

public void ShowRewardedAd()
{

if (Advertisement.IsReady ("rewardedVideo"))
{
var options = new ShowOptions { resultCallback = HandleShowResult };
Advertisement.Show ("rewardedVideo", options);
print ("ad is ready");
}
else
{
ResultAction();
print ("ad is fail");
}
}
private void HandleShowResult(ShowResult result)
{
switch (result)
{
case ShowResult.Finished:
print("The ad was successfully shown.");
ResultAction();
break;
case ShowResult.Skipped:
print("The ad was skipped before reaching the end.");
ResultAction();
break;
case ShowResult.Failed:
print("The ad failed to be shown.");
ResultAction();
break;
}
}
private void ResultAction()
{
GameObject.Find ("GameManager").GetComponent<GameManager> ().gamestart ();
GameObject.Find("ParentPlayer").GetComponent<Bounce>().alive();
print ("AD_looking finish");
}
}