Unlike Mozilla Firefox, I've always assumed that Google Chrome does not come with its own certificate trust store, but uses that of the OS. At least on Windows 7 any certificate management related tasks seem to redirect to the same dialog as IE.
But in this case how can Google as a browser vendor announce that they are revoking trust for certain CAs (e.g. WoSign, or more recently Symantec) from Chrome? Isn't the trust store managed and updated by the OS vendor (e.g. Microsoft)?