[net/dns] Resolve AF_UNSPEC on dual-stacked systems. Sort addresses according to RFC3484.

net/dns/dns_response.h

Index: net/dns/dns_response.h
diff --git a/net/dns/dns_response.h b/net/dns/dns_response.h
index 5ade458803b5fc21c3261fe53af28fbf27337c5a..c599ba126ee7bdb7a36426cf1eac7031d900b015 100644
--- a/net/dns/dns_response.h
+++ b/net/dns/dns_response.h
@@ -81,7 +81,7 @@ class NET_EXPORT_PRIVATE DnsResponse {
  public:
   // Possible results from ParseToAddressList.
   enum Result {
-    DNS_SUCCESS = 0,
+    DNS_PARSE_OK = 0,
     DNS_MALFORMED_RESPONSE,    // DnsRecordParser failed before the end of
                                // packet.
     DNS_MALFORMED_CNAME,       // Could not parse CNAME out of RRDATA.