Convert JsonWriter::Write to taking a const ref for the in-param

remoting/base/vlog_net_log.cc

Index: remoting/base/vlog_net_log.cc
diff --git a/remoting/base/vlog_net_log.cc b/remoting/base/vlog_net_log.cc
index 39a388a79adaa3b7c491fab43bc2537ac2acf69a..bfcea02a3ae6b07ad6b30cc33267f7724c526a83 100644
--- a/remoting/base/vlog_net_log.cc
+++ b/remoting/base/vlog_net_log.cc
@@ -35,7 +35,7 @@ void VlogNetLog::Observer::OnAddEntry(const net::NetLog::Entry& entry) {
   if (VLOG_IS_ON(4)) {
     scoped_ptr<base::Value> value(entry.ToValue());
     std::string json;
-    base::JSONWriter::Write(value.get(), &json);
+    base::JSONWriter::Write(*value, &json);
     VLOG(4) << json;
   }
 }