Remove ListValue::Append(new {Fundamental,String}Value(...)) pattern in //chrome

chrome/browser/notifications/notifier_state_tracker.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/notifications/notifier_state_tracker.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 159 matching lines @@
   SetNotifierEnabled(notifier_id, true);
 }
 
 void NotifierStateTracker::FirePermissionLevelChangedEvent(
     const NotifierId& notifier_id, bool enabled) {
   DCHECK_EQ(NotifierId::APPLICATION, notifier_id.type);
   extensions::api::notifications::PermissionLevel permission =
       enabled ? extensions::api::notifications::PERMISSION_LEVEL_GRANTED
               : extensions::api::notifications::PERMISSION_LEVEL_DENIED;
   std::unique_ptr<base::ListValue> args(new base::ListValue());
-  args->Append(new base::StringValue(
-      extensions::api::notifications::ToString(permission)));
+  args->AppendString(extensions::api::notifications::ToString(permission));
   std::unique_ptr<extensions::Event> event(new extensions::Event(
       extensions::events::NOTIFICATIONS_ON_PERMISSION_LEVEL_CHANGED,
       extensions::api::notifications::OnPermissionLevelChanged::kEventName,
       std::move(args)));
   extensions::EventRouter::Get(profile_)
       ->DispatchEventToExtension(notifier_id.id, std::move(event));
 
   // Tell the IO thread that this extension's permission for notifications
   // has changed.
   extensions::InfoMap* extension_info_map =
       extensions::ExtensionSystem::Get(profile_)->info_map();
   content::BrowserThread::PostTask(
       content::BrowserThread::IO, FROM_HERE,
       base::Bind(&extensions::InfoMap::SetNotificationsDisabled,
                  extension_info_map, notifier_id.id, !enabled));
 }
 #endif