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

components/invalidation/invalidation_util.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/invalidation/invalidation_util.h"
 
 #include <ostream>
 #include <sstream>
 
 #include "base/json/json_writer.h"
@@ skipping 43 matching lines @@
   std::string name;
   int source = 0;
   if (!value.GetInteger("source", &source) || !value.GetString("name", &name)) {
     return false;
   }
   *out = invalidation::ObjectId(source, name);
   return true;
 }
 
 std::string ObjectIdToString(const invalidation::ObjectId& object_id) {
-  scoped_ptr<base::DictionaryValue> value(ObjectIdToValue(object_id));
   std::string str;
-  base::JSONWriter::Write(value.get(), &str);
+  base::JSONWriter::Write(*ObjectIdToValue(object_id), &str);
   return str;
 }
 
 }  // namespace syncer