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

chrome/browser/profile_resetter/resettable_settings_snapshot.cc

 // Copyright (c) 2013 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/profile_resetter/resettable_settings_snapshot.h"
 
 #include "base/json/json_writer.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 197 matching lines @@
                          base::ASCIIToUTF16("\'"), &arguments);
       list->AppendString(arguments);
     }
     dict.Set(kShortcuts, list);
   }
 
   static_assert(ResettableSettingsSnapshot::ALL_FIELDS == 31,
                 "new field needs to be serialized here");
 
   std::string json;
-  base::JSONWriter::Write(&dict, &json);
+  base::JSONWriter::Write(dict, &json);
   return json;
 }
 
 void SendSettingsFeedback(const std::string& report,
                           Profile* profile,
                           SnapshotCaller caller) {
   scoped_refptr<FeedbackData> feedback_data = new FeedbackData();
   std::string bucket;
   switch (caller) {
     case PROFILE_RESET_WEBUI:
@@ skipping 130 matching lines @@
       extension_names += '\n';
     extension_names += i->second;
   }
   if (!extension_names.empty()) {
     AddPair(list.get(),
             l10n_util::GetStringUTF16(IDS_RESET_PROFILE_SETTINGS_EXTENSIONS),
             extension_names);
   }
   return list.Pass();
 }