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

remoting/host/host_config.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 "remoting/host/host_config.h"
 
 #include "base/files/file_util.h"
 #include "base/files/important_file_writer.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
@@ skipping 10 matching lines @@
     return nullptr;
   }
 
   scoped_ptr<base::DictionaryValue> config(
       static_cast<base::DictionaryValue*>(value.release()));
   return config.Pass();
 }
 
 std::string HostConfigToJson(const base::DictionaryValue& host_config) {
   std::string data;
-  base::JSONWriter::Write(&host_config, &data);
+  base::JSONWriter::Write(host_config, &data);
   return data;
 }
 
 scoped_ptr<base::DictionaryValue> HostConfigFromJsonFile(
     const base::FilePath& config_file) {
   // TODO(sergeyu): Implement better error handling here.
   std::string serialized;
   if (!base::ReadFileToString(config_file, &serialized)) {
     LOG(WARNING) << "Failed to read " << config_file.value();
     return nullptr;
   }
 
   return HostConfigFromJson(serialized);
 }
 
 bool HostConfigToJsonFile(const base::DictionaryValue& host_config,
                           const base::FilePath& config_file) {
   std::string serialized = HostConfigToJson(host_config);
   return base::ImportantFileWriter::WriteFileAtomically(config_file,
                                                         serialized);
 }
 
 }  // namespace remoting