> +         return ImmutableSet.of();
> +      }
> +      return listSecurityGroupsInLocation(zone);
> +   }
> +
> +   public Set<SecurityGroup> listSecurityGroupsInLocation(String zone) {
> +      Iterable<? extends SecurityGroupInZone> rawGroups = 
> pollSecurityGroupsByZone(zone);
> +      Iterable<SecurityGroup> groups = transform(filter(rawGroups, 
> notNull()),
> +              groupConverter);
> +      return ImmutableSet.copyOf(groups);
> +   }
> +
> +   @Override
> +   public Set<SecurityGroup> listSecurityGroupsForNode(String id) {
> +      checkNotNull(id, "id");
> +      ZoneAndId zoneAndId = ZoneAndId.fromSlashEncoded(id);

[minor] Combine these two lines?

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