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

net/dns/dns_response_unittest.cc

Index: net/dns/dns_response_unittest.cc
diff --git a/net/dns/dns_response_unittest.cc b/net/dns/dns_response_unittest.cc
index bb053bc24bef87795fb699ad7cf8a0d6d52e8183..6ed6f062b5e6693a4ce1b089f797346806d88a65 100644
--- a/net/dns/dns_response_unittest.cc
+++ b/net/dns/dns_response_unittest.cc
@@ -299,7 +299,7 @@ TEST(DnsResponseTest, ParseToAddressList) {
     DnsResponse response(t.response_data, t.response_size, t.query_size);
     AddressList addr_list;
     base::TimeDelta ttl;
-    EXPECT_EQ(DnsResponse::DNS_SUCCESS,
+    EXPECT_EQ(DnsResponse::DNS_PARSE_OK,
               response.ParseToAddressList(&addr_list, &ttl));
     std::vector<const char*> expected_addresses(
         t.expected_addresses,
@@ -429,8 +429,9 @@ TEST(DnsResponseTest, ParseToAddressListFail) {
       DnsResponse::DNS_CNAME_AFTER_ADDRESS },
     { kResponseTTLMismatch, arraysize(kResponseTTLMismatch),
       DnsResponse::DNS_ADDRESS_TTL_MISMATCH },
+    // Not actually a failure, just an empty result.
     { kResponseNoAddresses, arraysize(kResponseNoAddresses),
-      DnsResponse::DNS_NO_ADDRESSES },
+      DnsResponse::DNS_PARSE_OK },
   };
 
   const size_t kQuerySize = 12 + 7;