Uhm, all root certs are self-signed.
And it's not the actual root cert that will be used for their sites. It'll be kept very much offline (HSM in a vault/safe, probably), or else they would be very much in violation of any established rules for CAs.
At most this will result in a shorter certificate chain. Usually CAs just sign a couple intermediary certs with their root and then use them to issue certs so a compromised cert will have less impact. Google could conceivably, if their organization allows it, actually sign the certs for their sites directly with the root.
Biting the hand that feeds IT
