Remove base::Value::CreateNullValue

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

 // Copyright 2016 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/on_startup_handler.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "chrome/browser/extensions/settings_api_helpers.h"
@@ skipping 23 matching lines @@
   const base::Value* callback_id;
   CHECK(args->Get(0, &callback_id));
 
   AllowJavascript();
 
   Profile* profile = Profile::FromWebUI(web_ui());
   const extensions::Extension* ntp_extension =
       extensions::GetExtensionOverridingNewTabPage(profile);
 
   if (!ntp_extension) {
-    ResolveJavascriptCallback(*callback_id, *base::Value::CreateNullValue());
+    ResolveJavascriptCallback(*callback_id, base::Value());
     return;
   }
 
   base::DictionaryValue dict;
   dict.SetString("id", ntp_extension->id());
   dict.SetString("name", ntp_extension->name());
   dict.SetBoolean("canBeDisabled",
                   !extensions::ExtensionSystem::Get(profile)
                        ->management_policy()
                        ->MustRemainEnabled(ntp_extension, nullptr));
   ResolveJavascriptCallback(*callback_id, dict);
 }
 
 void OnStartupHandler::HandleValidateStartupPage(const base::ListValue* args) {
   AllowJavascript();
 
   CHECK_EQ(args->GetSize(), 2U);
 
   const base::Value* callback_id;
   CHECK(args->Get(0, &callback_id));
 
   std::string url_string;
   CHECK(args->GetString(1, &url_string));
 
   bool valid = settings_utils::FixupAndValidateStartupPage(url_string, nullptr);
   ResolveJavascriptCallback(*callback_id, base::Value(valid));
 }
 
 }  // namespace settings