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

chromeos/network/shill_property_util.cc

Index: chromeos/network/shill_property_util.cc
diff --git a/chromeos/network/shill_property_util.cc b/chromeos/network/shill_property_util.cc
index a53487b04f79f590ec33979d93197e7f69e88fbe..30a6925bb6af2f6696d18904a9c0b17186123bf1 100644
--- a/chromeos/network/shill_property_util.cc
+++ b/chromeos/network/shill_property_util.cc
@@ -221,7 +221,7 @@ void SetUIData(const NetworkUIData& ui_data,
   base::DictionaryValue ui_data_dict;
   ui_data.FillDictionary(&ui_data_dict);
   std::string ui_data_blob;
-  base::JSONWriter::Write(&ui_data_dict, &ui_data_blob);
+  base::JSONWriter::Write(ui_data_dict, &ui_data_blob);
   shill_dictionary->SetStringWithoutPathExpansion(shill::kUIDataProperty,
                                                   ui_data_blob);
 }