Remove base::Value::CreateNullValue

chrome/browser/ui/webui/settings/settings_startup_pages_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_startup_pages_handler.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 113 matching lines @@
 }
 
 void StartupPagesHandler::HandleEditStartupPage(const base::ListValue* args) {
   CHECK_EQ(args->GetSize(), 3U);
   const base::Value* callback_id;
   CHECK(args->Get(0, &callback_id));
   int index;
   CHECK(args->GetInteger(1, &index));
 
   if (index < 0 || index > startup_custom_pages_table_model_.RowCount()) {
-    RejectJavascriptCallback(*callback_id, *base::Value::CreateNullValue());
+    RejectJavascriptCallback(*callback_id, base::Value());
     NOTREACHED();
     return;
   }
 
   std::string url_string;
   CHECK(args->GetString(2, &url_string));
 
   GURL fixed_url;
   if (settings_utils::FixupAndValidateStartupPage(url_string, &fixed_url)) {
     std::vector<GURL> urls = startup_custom_pages_table_model_.GetURLs();
@@ skipping 48 matching lines @@
 
 void StartupPagesHandler::UpdateStartupPages() {
   const SessionStartupPref startup_pref = SessionStartupPref::GetStartupPref(
       Profile::FromWebUI(web_ui())->GetPrefs());
   startup_custom_pages_table_model_.SetURLs(startup_pref.urls);
   // The change will go to the JS code in the
   // StartupPagesHandler::OnModelChanged() method.
 }
 
 }  // namespace settings