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

chrome/browser/supervised_user/supervised_user_settings_service.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 "chrome/browser/supervised_user/supervised_user_settings_service.h"
 
 #include "base/callback.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/prefs/json_pref_store.h"
@@ skipping 145 matching lines @@
     local_settings_->RemoveWithoutPathExpansion(key, NULL);
 
   InformSubscribers();
 }
 
 // static
 SyncData SupervisedUserSettingsService::CreateSyncDataForSetting(
     const std::string& name,
     const base::Value& value) {
   std::string json_value;
-  base::JSONWriter::Write(&value, &json_value);
+  base::JSONWriter::Write(value, &json_value);
   ::sync_pb::EntitySpecifics specifics;
   specifics.mutable_managed_user_setting()->set_name(name);
   specifics.mutable_managed_user_setting()->set_value(json_value);
   return SyncData::CreateLocalData(name, name, specifics);
 }
 
 void SupervisedUserSettingsService::Shutdown() {
   store_->RemoveObserver(this);
 }
 
@@ skipping 223 matching lines @@
 }
 
 void SupervisedUserSettingsService::InformSubscribers() {
   if (!IsReady())
     return;
 
   scoped_ptr<base::DictionaryValue> settings = GetSettings();
   for (const auto& callback : subscribers_)
     callback.Run(settings.get());
 }