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

base/json/json_string_value_serializer.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 "base/json/json_string_value_serializer.h"
 
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 
@@ skipping 19 matching lines @@
                                                   bool omit_binary_values) {
   if (!json_string_)
     return false;
 
   int options = 0;
   if (omit_binary_values)
     options |= base::JSONWriter::OPTIONS_OMIT_BINARY_VALUES;
   if (pretty_print_)
     options |= base::JSONWriter::OPTIONS_PRETTY_PRINT;
 
-  return base::JSONWriter::WriteWithOptions(&root, options, json_string_);
+  return base::JSONWriter::WriteWithOptions(root, options, json_string_);
 }
 
 JSONStringValueDeserializer::JSONStringValueDeserializer(
     const base::StringPiece& json_string)
     : json_string_(json_string),
       allow_trailing_comma_(false) {
 }
 
 JSONStringValueDeserializer::~JSONStringValueDeserializer() {}
 
 Value* JSONStringValueDeserializer::Deserialize(int* error_code,
                                                 std::string* error_str) {
   return base::JSONReader::ReadAndReturnError(json_string_,
       allow_trailing_comma_ ? base::JSON_ALLOW_TRAILING_COMMAS :
           base::JSON_PARSE_RFC,
       error_code, error_str);
 }