Chavez-Perez v. Ashcroft, 386 F.3d 1284 (9th Cir. Oct. 27, 2004) (although Oregon expungement would erase simple possession conviction, if granted, the immigration authorities may remove noncitizen before expungement is granted; court distinguished between situation where, as here, noncitizen had not yet made any attempt to begin expungement, and where the noncitizen is in process of obtaining an expungement by court order).