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

chrome/browser/extensions/api/storage/settings_sync_util.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 "chrome/browser/extensions/api/storage/settings_sync_util.h"
 
 #include "base/json/json_writer.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/api/storage/sync_value_store_cache.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 12 matching lines @@
 
 void PopulateExtensionSettingSpecifics(
     const std::string& extension_id,
     const std::string& key,
     const base::Value& value,
     sync_pb::ExtensionSettingSpecifics* specifics) {
   specifics->set_extension_id(extension_id);
   specifics->set_key(key);
   {
     std::string value_as_json;
-    base::JSONWriter::Write(&value, &value_as_json);
+    base::JSONWriter::Write(value, &value_as_json);
     specifics->set_value(value_as_json);
   }
 }
 
 void PopulateAppSettingSpecifics(
     const std::string& extension_id,
     const std::string& key,
     const base::Value& value,
     sync_pb::AppSettingSpecifics* specifics) {
   PopulateExtensionSettingSpecifics(
@@ skipping 72 matching lines @@
   DCHECK(type == syncer::APP_SETTINGS || type == syncer::EXTENSION_SETTINGS);
   StorageFrontend* frontend = StorageFrontend::Get(context);
   SyncValueStoreCache* sync_cache = static_cast<SyncValueStoreCache*>(
       frontend->GetValueStoreCache(settings_namespace::SYNC));
   return sync_cache->GetSyncableService(type);
 }
 
 }  // namespace settings_sync_util
 
 }  // namespace extensions