Update OS X to use scoped_refptr<T>::get() rather than implicit "operator T*"

cloud_print/gcp20/prototype/dns_sd_server.cc

Index: cloud_print/gcp20/prototype/dns_sd_server.cc
diff --git a/cloud_print/gcp20/prototype/dns_sd_server.cc b/cloud_print/gcp20/prototype/dns_sd_server.cc
index 2d2716b63dd4cd7f766843649a00c2fcb0bc9969..60c955e09e8ab29c752e824b816094112507a87a 100644
--- a/cloud_print/gcp20/prototype/dns_sd_server.cc
+++ b/cloud_print/gcp20/prototype/dns_sd_server.cc
@@ -241,10 +241,12 @@ void DnsSdServer::DoLoop(int rv) {
   // TODO(maksymb): Check what happened if buffer will be overflowed
   do {
     if (rv > 0)
-      ProcessMessage(rv, recv_buf_);
-    rv = socket_->RecvFrom(recv_buf_, recv_buf_->size(), &recv_address_,
-                           base::Bind(&DnsSdServer::DoLoop,
-                                      base::Unretained(this)));
+      ProcessMessage(rv, recv_buf_.get());
+    rv = socket_->RecvFrom(
+        recv_buf_.get(),
+        recv_buf_->size(),
+        &recv_address_,
+        base::Bind(&DnsSdServer::DoLoop, base::Unretained(this)));
   } while (rv > 0);
 
   // TODO(maksymb): Add handler for errors