Migrate upgrade notifications to observer

chrome/browser/ui/ash/system_tray_client.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_CLIENT_H_
 #define CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_CLIENT_H_
 
 #include "ash/public/interfaces/system_tray.mojom.h"
 #include "base/macros.h"
 #include "chrome/browser/chromeos/system/system_clock_observer.h"
 #include "chrome/browser/upgrade_observer.h"
 #include "components/policy/core/common/cloud/cloud_policy_store.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
 #include "mojo/public/cpp/bindings/binding.h"
 
 namespace ash {
 enum class LoginStatus;
 }
 
 namespace views {
 class Widget;
 class WidgetDelegate;
 }
 
 // Handles method calls delegated back to chrome from ash. Also notifies ash of
 // relevant state changes in chrome.
 // TODO: Consider renaming this to SystemTrayClientChromeOS.
 class SystemTrayClient : public ash::mojom::SystemTrayClient,
                          public chromeos::system::SystemClockObserver,
                          public policy::CloudPolicyStore::Observer,
-                         public content::NotificationObserver,
                          public UpgradeObserver {
  public:
   SystemTrayClient();
   ~SystemTrayClient() override;
 
   static SystemTrayClient* Get();
 
   // Returns the login state based on the user type, lock screen status, etc.
   static ash::LoginStatus GetUserLoginStatus();
 
@@ skipping 51 matching lines @@
 
   // Requests that ash show the update available icon.
   void HandleUpdateAvailable();
 
   // Requests that ash show the update over cellular available icon.
   void HandleUpdateOverCellularAvailable();
 
   // chromeos::system::SystemClockObserver:
   void OnSystemClockChanged(chromeos::system::SystemClock* clock) override;
 
-  // UpgradeObserver:
+  // UpgradeObserver implementation.
   void OnUpdateOverCellularAvailable() override;
+  void OnUpgradeRecommended() override;
 
   // policy::CloudPolicyStore::Observer
   void OnStoreLoaded(policy::CloudPolicyStore* store) override;
   void OnStoreError(policy::CloudPolicyStore* store) override;
 
   void UpdateEnterpriseDomain();
 
-  // content::NotificationObserver:
-  void Observe(int type,
-               const content::NotificationSource& source,
-               const content::NotificationDetails& details) override;
-
   // System tray mojo service in ash.
   ash::mojom::SystemTrayPtr system_tray_;
 
   // Binds this object to the client interface.
   mojo::Binding<ash::mojom::SystemTrayClient> binding_;
 
   // Whether an Adobe Flash component update is available.
   bool flash_update_available_ = false;
 
   // Avoid sending ash an empty enterprise domain at startup and suppress
   // duplicate IPCs during the session.
   std::string last_enterprise_domain_;
   bool last_active_directory_managed_ = false;
 
-  content::NotificationRegistrar registrar_;
-
   DISALLOW_COPY_AND_ASSIGN(SystemTrayClient);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_CLIENT_H_