> Chrome does not perform pin validation when the certificate chain chains up to a private trust anchor. A key result of this policy is that private trust anchors can be used to proxy (or MITM) connections, even to pinned sites.
> Late on December 24, Chrome detected and blocked an unauthorized digital certificate for the "*.google.com" domain.
https://security.googleblog.com/2013/01/enhancing-digital-ce...
> Chrome does not perform pin validation when the certificate chain chains up to a private trust anchor. A key result of this policy is that private trust anchors can be used to proxy (or MITM) connections, even to pinned sites.