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

base/json/json_value_serializer_unittest.cc

 // Copyright (c) 2012 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 <string>
 
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/json/json_reader.h"
@@ skipping 284 matching lines @@
       "\xC3\xA8\xC3\xA9\xC3\xAA\xC3\xAB\xC3\xAC\xC3\xAD\xC3\xAE\xC3\xAF\xC3\xB0"
       "\xC3\xB1\xC3\xB2\xC3\xB3\xC3\xB4\xC3\xB5\xC3\xB6\xC3\xB7\xC3\xB8\xC3\xB9"
       "\xC3\xBA\xC3\xBB\xC3\xBC\xC3\xBD\xC3\xBE\xC3\xBF";
 
   std::string expected_output = "{\"all_chars\":\"" + all_chars_expected +
                                  "\"}";
   // Test JSONWriter interface
   std::string output_js;
   DictionaryValue valueRoot;
   valueRoot.SetString("all_chars", all_chars);
-  JSONWriter::Write(&valueRoot, &output_js);
+  JSONWriter::Write(valueRoot, &output_js);
   ASSERT_EQ(expected_output, output_js);
 
   // Test JSONValueSerializer interface (uses JSONWriter).
   JSONStringValueSerializer serializer(&output_js);
   ASSERT_TRUE(serializer.Serialize(valueRoot));
   ASSERT_EQ(expected_output, output_js);
 }
 
 TEST(JSONValueSerializerTest, UnicodeStrings) {
   // unicode string json -> escaped ascii text
@@ skipping 172 matching lines @@
   ASSERT_TRUE(PathExists(source_file_path));
   JSONFileValueDeserializer deserializer(source_file_path);
   scoped_ptr<Value> root;
   root.reset(deserializer.Deserialize(NULL, NULL));
   ASSERT_TRUE(root.get());
 }
 
 }  // namespace
 
 }  // namespace base