Refactor MessageCenterSettingsController.

chrome/browser/notifications/system_component_notifier_source_chromeos.h

+// Copyright (c) 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.
+
+#ifndef CHROME_BROWSER_NOTIFICATIONS_SYSTEM_COMPONENT_NOTIFIER_SOURCE_CHROMEOS_H_
+#define CHROME_BROWSER_NOTIFICATIONS_SYSTEM_COMPONENT_NOTIFIER_SOURCE_CHROMEOS_H_
+
+#include "chrome/browser/notifications/notifier_source.h"
+
+class SystemComponentNotifierSourceChromeOS : public NotifierSource {
+ public:
+  explicit SystemComponentNotifierSourceChromeOS(Observer* observer);
+  std::vector<std::unique_ptr<message_center::Notifier>> GetNotifierList(
+      Profile* profile) override;
+  void SetNotifierEnabled(Profile* profile,
+                          const message_center::Notifier& notifier,
+                          bool enabled) override;
+  message_center::NotifierId::NotifierType GetNotifierType() override;
+
+ private:
+  // Lifetime of parent must be longer than the source.
+  Observer* observer_;
+};
+
+#endif  // CHROME_BROWSER_NOTIFICATIONS_SYSTEM_COMPONENT_NOTIFIER_SOURCE_CHROMEOS_H_