cryptohome: Add the conversion for a new error code.

chromeos/cryptohome/homedir_methods.cc

Index: chromeos/cryptohome/homedir_methods.cc
diff --git a/chromeos/cryptohome/homedir_methods.cc b/chromeos/cryptohome/homedir_methods.cc
index efa0cec32334f8cf1bb56daa134d154011c9b716..617c17afd9cf2c864daa36fe585939009aa64e42 100644
--- a/chromeos/cryptohome/homedir_methods.cc
+++ b/chromeos/cryptohome/homedir_methods.cc
@@ -161,6 +161,10 @@ MountError MapError(CryptohomeErrorCode code) {
     case CRYPTOHOME_ERROR_KEY_LABEL_EXISTS:
     case CRYPTOHOME_ERROR_UPDATE_SIGNATURE_INVALID:
       return MOUNT_ERROR_KEY_FAILURE;
+    case CRYPTOHOME_ERROR_MOUNT_OLD_ENCRYPTION:
+      return MOUNT_ERROR_OLD_ENCRYPTION;
+    case CRYPTOHOME_ERROR_MOUNT_PREVIOUS_MIGRATION_INCOMPLETE:
+      return MOUNT_ERROR_PREVIOUS_MIGRATION_INCOMPLETE;
     default:
       NOTREACHED();
       return MOUNT_ERROR_FATAL;