Revert of ash: Use system tray mojo interface to show system update tray icon

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 "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 content::NotificationObserver {
+                         public chromeos::system::SystemClockObserver {
  public:
   SystemTrayClient();
   ~SystemTrayClient() override;
 
   static SystemTrayClient* Get();
 
   // Returns the login state based on the user type, lock screen status, etc.
   static ash::LoginStatus GetUserLoginStatus();
 
   // Returns the container id for the parent window for new dialogs. The parent
   // varies based on the current login and lock screen state.
   static int GetDialogParentContainerId();
 
   // Creates a modal dialog in the parent window for new dialogs on the primary
   // display. See GetDialogParentContainerId() and views::CreateDialogWidget().
   // The returned widget is owned by its native widget.
   static views::Widget* CreateUnownedDialogWidget(
       views::WidgetDelegate* widget_delegate);
 
-  // Shows an update icon for an Adobe Flash update and forces a device reboot
-  // when the update is applied.
-  void SetFlashUpdateAvailable();
-
   // ash::mojom::SystemTrayClient:
   void ShowSettings() override;
   void ShowDateSettings() override;
   void ShowSetTimeDialog() override;
   void ShowDisplaySettings() override;
   void ShowPowerSettings() override;
   void ShowChromeSlow() override;
   void ShowIMESettings() override;
   void ShowHelp() override;
   void ShowAccessibilityHelp() override;
   void ShowAccessibilitySettings() override;
   void ShowPaletteHelp() override;
   void ShowPaletteSettings() override;
   void ShowPublicAccountInfo() override;
   void ShowNetworkConfigure(const std::string& network_id) override;
   void ShowNetworkCreate(const std::string& type) override;
   void ShowThirdPartyVpnCreate(const std::string& extension_id) override;
   void ShowNetworkSettings(const std::string& network_id) override;
   void ShowProxySettings() override;
   void SignOut() override;
   void RequestRestartForUpdate() override;
 
  private:
-  // Requests that ash show the update available icon.
-  void HandleUpdateAvailable();
-
   // chromeos::system::SystemClockObserver:
   void OnSystemClockChanged(chromeos::system::SystemClock* clock) override;
 
-  // 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;
-
-  content::NotificationRegistrar registrar_;
-
   DISALLOW_COPY_AND_ASSIGN(SystemTrayClient);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_CLIENT_H_