Get the last time a #WebKitITPThirdParty has been seen under itp_first_party.
Each WebKitITPFirstParty is created by webkit.itpthird_party.ITPThirdParty.getFirstParties and therefore corresponds to exactly one #WebKitITPThirdParty.
the last update time as a #GDateTime
Get the last time a #WebKitITPThirdParty has been seen under itp_first_party.
Each WebKitITPFirstParty is created by webkit.itpthird_party.ITPThirdParty.getFirstParties and therefore corresponds to exactly one #WebKitITPThirdParty.