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

net/log/test_net_log_entry.cc

Index: net/log/test_net_log_entry.cc
diff --git a/net/log/test_net_log_entry.cc b/net/log/test_net_log_entry.cc
index d22515f180c917aa27a9c3af2aa7ddbdaa9371a2..0fd3fc32596da54cddc8045ca5ac6796db85ebd7 100644
--- a/net/log/test_net_log_entry.cc
+++ b/net/log/test_net_log_entry.cc
@@ -69,7 +69,7 @@ std::string TestNetLogEntry::GetParamsJson() const {
   if (!params)
     return std::string();
   std::string json;
-  base::JSONWriter::Write(params.get(), &json);
+  base::JSONWriter::Write(*params, &json);
   return json;
 }