Remove base::Value::CreateNullValue

chrome/browser/ui/webui/settings/site_settings_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/site_settings_handler.h"
 
 #include <algorithm>
 #include <memory>
 #include <string>
 #include <utility>
@@ skipping 558 matching lines @@
       Profile* incognito = profile_->GetOffTheRecordProfile();
       map = HostContentSettingsMapFactory::GetForProfile(incognito);
       extension_registry = extensions::ExtensionRegistry::Get(incognito);
       site_settings::GetExceptionsFromHostContentSettingsMap(
           map, content_type, extension_registry, web_ui(), /*incognito=*/true,
           /*filter=*/&site, exceptions.get());
     }
   }
 
   if (!exceptions->GetSize()) {
-    RejectJavascriptCallback(*callback_id, *base::Value::CreateNullValue());
+    RejectJavascriptCallback(*callback_id, base::Value());
     return;
   }
 
   // We only need a single response element.
   const base::DictionaryValue* exception = nullptr;
   exceptions->GetDictionary(0, &exception);
   ResolveJavascriptCallback(*callback_id, *exception);
 }
 
 void SiteSettingsHandler::HandleIsPatternValid(
@@ skipping 128 matching lines @@
     origin = content::kUnreachableWebDataURL;
   }
 
   content::HostZoomMap* host_zoom_map;
   host_zoom_map = content::HostZoomMap::GetDefaultForBrowserContext(profile_);
   double default_level = host_zoom_map->GetDefaultZoomLevel();
   host_zoom_map->SetZoomLevelForHost(origin, default_level);
 }
 
 }  // namespace settings