code: func (util *GCEDiskUtil) DeleteVolume(d *gcePersistentDiskDeleter) error {
  	cloud, err := getCloudProvider(d.gcePersistentDisk.plugin.host.GetCloudProvider())
  	if err != nil {
  		return err
  	}
  
  	if err = cloud.DeleteDisk(d.pdName); err != nil {
  		klog.V(2).Infof("Error deleting GCE PD volume %s: %v", d.pdName, err)
  		// GCE cloud provider returns volume.deletedVolumeInUseError when
  		// necessary, no handling needed here.
  		return err
  	}
  	klog.V(2).Infof("Successfully deleted GCE PD volume %s", d.pdName)
  	return nil
  }
docs: // DeleteVolume deletes a GCE PD
  // Returns: error