ash: Fix system tray avatar not updated regression

chrome/browser/ui/ash/system_tray_delegate_chromeos.h

Index: chrome/browser/ui/ash/system_tray_delegate_chromeos.h
diff --git a/chrome/browser/ui/ash/system_tray_delegate_chromeos.h b/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
index 2a43ef8442d6e4990742b029ed31e7569c1d2b38..5213d71a1e9323d476dd916514e381c100276771 100644
--- a/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
+++ b/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
@@ -95,13 +95,7 @@ class SystemTrayDelegateChromeOS
   std::unique_ptr<ash::SystemTrayItem> CreateRotationLockTrayItem(
       ash::SystemTray* tray) override;
 
-  // Overridden from user_manager::UserManager::Observer:
-  void OnUserImageChanged(const user_manager::User& user) override;
-
   // Overridden from user_manager::UserManager::UserSessionStateObserver:
-  void UserAddedToSession(const user_manager::User* active_user) override;
-  void ActiveUserChanged(const user_manager::User* active_user) override;
-
   void UserChangedChildStatus(user_manager::User* user) override;
 
  private: