Remove base::Value::CreateNullValue

chrome/browser/ui/webui/local_discovery/local_discovery_ui_handler.cc

 // Copyright 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/ui/webui/local_discovery/local_discovery_ui_handler.h"
 
 #include <set>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 343 matching lines @@
   if (description.id.empty()) {
     info.SetString(kDictionaryKeyServiceName, name);
     info.SetString(kDictionaryKeyDisplayName, description.name);
     info.SetString(kDictionaryKeyDescription, description.description);
     info.SetString(kDictionaryKeyType, description.type);
     info.SetBoolean(kDictionaryKeyIsWifi, false);
 
     web_ui()->CallJavascriptFunctionUnsafe(
         "local_discovery.onUnregisteredDeviceUpdate", service_key, info);
   } else {
-    std::unique_ptr<base::Value> null_value = base::Value::CreateNullValue();
+    auto null_value = base::MakeUnique<base::Value>();
 
     web_ui()->CallJavascriptFunctionUnsafe(
         "local_discovery.onUnregisteredDeviceUpdate", service_key, *null_value);
   }
 }
 
 void LocalDiscoveryUIHandler::DeviceRemoved(const std::string& name) {
   device_descriptions_.erase(name);
-  std::unique_ptr<base::Value> null_value = base::Value::CreateNullValue();
+  auto null_value = base::MakeUnique<base::Value>();
   base::Value name_value(kKeyPrefixMDns + name);
 
   web_ui()->CallJavascriptFunctionUnsafe(
       "local_discovery.onUnregisteredDeviceUpdate", name_value, *null_value);
 }
 
 void LocalDiscoveryUIHandler::DeviceCacheFlushed() {
   web_ui()->CallJavascriptFunctionUnsafe(
       "local_discovery.onDeviceCacheFlushed");
   privet_lister_->DiscoverNewDevices(false);
@@ skipping 226 matching lines @@
     service->RefreshStatusFromService();
 }
 
 CloudPrintProxyService* LocalDiscoveryUIHandler::GetCloudPrintProxyService() {
   return CloudPrintProxyServiceFactory::GetForProfile(
       Profile::FromWebUI(web_ui()));
 }
 #endif  // defined(CLOUD_PRINT_CONNECTOR_UI_AVAILABLE)
 
 }  // namespace local_discovery