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 948693b8f75478d211668aa6d35d2868245d3c6a..34e9ffa6dc0518b6281ef54075d2741ca4be318b 100644
--- a/net/log/test_net_log_entry.cc
+++ b/net/log/test_net_log_entry.cc
@@ -76,7 +76,7 @@ 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;
 }