Changed: The following operations on the boot disk of a Compute Engine instance

## Change Change **Changed**: The following operations on the boot disk of a Compute Engine instance that has a service account attached no longer require the `iam.serviceAccounts.actAs`permission. In the following list, the boot disk of such an instance is referred to as the _source disk_. * Creating a standard or archive snapshot of the source disk. * Cloning the source disk. * Creating a machine image of the instance. * Creating a custom image of the source disk. * Starting asynchronous replication of the source disk to another region. * Creating a new disk when you create an instance, if the new disk is created from an instant snapshot of the source disk.