Remove base::Value::CreateNullValue

chrome/browser/ui/webui/settings/settings_clear_browsing_data_handler.cc

 // Copyright 2015 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/settings/settings_clear_browsing_data_handler.h"
 
 #include <stddef.h>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 244 matching lines @@
   // Needed because WebUI doesn't handle renderer crashes. See crbug.com/610450.
   task_observer_.reset();
 
   UpdateSyncState();
   RefreshHistoryNotice();
 
   // Restart the counters each time the dialog is reopened.
   for (const auto& counter : counters_)
     counter->Restart();
 
-  ResolveJavascriptCallback(
-      *callback_id,
-      *base::Value::CreateNullValue() /* Promise<void> */);
+  ResolveJavascriptCallback(*callback_id, base::Value() /* Promise<void> */);
 }
 
 void ClearBrowsingDataHandler::OnStateChanged(syncer::SyncService* sync) {
   UpdateSyncState();
 }
 
 void ClearBrowsingDataHandler::UpdateSyncState() {
   CallJavascriptFunction(
       "cr.webUIListenerCallback", base::Value("update-footer"),
       base::Value(sync_service_ && sync_service_->IsSyncActive()),
@@ skipping 48 matching lines @@
 
 void ClearBrowsingDataHandler::UpdateCounterText(
     std::unique_ptr<browsing_data::BrowsingDataCounter::Result> result) {
   CallJavascriptFunction(
       "cr.webUIListenerCallback", base::Value("update-counter-text"),
       base::Value(result->source()->GetPrefName()),
       base::Value(GetChromeCounterTextFromResult(result.get())));
 }
 
 }  // namespace settings