cros: Use SessionController to enable system tray settings / notifications tray

chrome/browser/ui/ash/system_tray_delegate_chromeos.h

 // Copyright 2013 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_DELEGATE_CHROMEOS_H_
 #define CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_DELEGATE_CHROMEOS_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 42 matching lines @@
   // Overridden from ash::SystemTrayDelegate:
   void Initialize() override;
   ash::LoginStatus GetUserLoginStatus() const override;
   std::string GetEnterpriseDomain() const override;
   base::string16 GetEnterpriseMessage() const override;
   std::string GetSupervisedUserManager() const override;
   base::string16 GetSupervisedUserManagerName() const override;
   base::string16 GetSupervisedUserMessage() const override;
   bool IsUserSupervised() const override;
   bool IsUserChild() const override;
-  bool ShouldShowSettings() const override;
-  bool ShouldShowNotificationTray() const override;
   void ShowEnterpriseInfo() override;
   void ShowUserLogin() override;
   void GetCurrentIME(ash::IMEInfo* info) override;
   void GetAvailableIMEList(ash::IMEInfoList* list) override;
   void GetCurrentIMEProperties(ash::IMEPropertyInfoList* list) override;
   base::string16 GetIMEManagedMessage() override;
   void SwitchIME(const std::string& ime_id) override;
   void ActivateIMEProperty(const std::string& key) override;
   ash::NetworkingConfigDelegate* GetNetworkingConfigDelegate() const override;
   bool GetSessionStartTime(base::TimeTicks* session_start_time) override;
@@ skipping 101 matching lines @@
       custodian_info_changed_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTrayDelegateChromeOS);
 };
 
 ash::SystemTrayDelegate* CreateSystemTrayDelegate();
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_DELEGATE_CHROMEOS_H_