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

net/base/host_resolver_impl.h

Index: net/base/host_resolver_impl.h
diff --git a/net/base/host_resolver_impl.h b/net/base/host_resolver_impl.h
index 4918208c8826abc728785b8db997f51255c573e5..ae7c8b687d24404fde5bb112c2f3c0b7f93ce68b 100644
--- a/net/base/host_resolver_impl.h
+++ b/net/base/host_resolver_impl.h
@@ -23,11 +23,13 @@
 #include "net/base/net_log.h"
 #include "net/base/network_change_notifier.h"
 #include "net/base/prioritized_dispatcher.h"
-#include "net/dns/dns_client.h"
-#include "net/dns/dns_config_service.h"
 
 namespace net {
 
+class DnsClient;
+struct DnsConfig;
+class DnsConfigService;

[mmenke, 2012/06/07 18:32:34]

I believe you can do the same for net_log.h as well.  Just need to forward
declare NetLog and BoundNetLog.

+
 // For each hostname that is requested, HostResolver creates a
 // HostResolverImpl::Job. When this job gets dispatched it creates a ProcTask
 // which runs the given HostResolverProc on a WorkerPool thread. If requests for