chromeos: Replace user image notifications with observer

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 44 matching lines @@
     : public ui::ime::InputMethodMenuManager::Observer,
       public ash::SystemTrayDelegate,
       public SessionManagerClient::Observer,
       public content::NotificationObserver,
       public input_method::InputMethodManager::Observer,
       public device::BluetoothAdapter::Observer,
       public policy::CloudPolicyStore::Observer,
       public ash::SessionStateObserver,
       public chrome::BrowserListObserver,
       public extensions::AppWindowRegistry::Observer,
+      public user_manager::UserManager::Observer,
       public user_manager::UserManager::UserSessionStateObserver,
       public SupervisedUserServiceObserver,
       public input_method::InputMethodManager::ImeMenuObserver {
  public:
   SystemTrayDelegateChromeOS();
 
   ~SystemTrayDelegateChromeOS() override;
 
   void InitializeOnAdapterReady(
       scoped_refptr<device::BluetoothAdapter> adapter);
@@ skipping 34 matching lines @@
   int GetSystemTrayMenuWidth() override;
   void ActiveUserWasChanged() override;
   bool IsSearchKeyMappedToCapsLock() override;
   void AddCustodianInfoTrayObserver(
       ash::CustodianInfoTrayObserver* observer) override;
   void RemoveCustodianInfoTrayObserver(
       ash::CustodianInfoTrayObserver* observer) override;
   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:
   ash::SystemTrayNotifier* GetSystemTrayNotifier();
 
   void SetProfile(Profile* profile);
@@ skipping 118 matching lines @@
   base::WeakPtrFactory<SystemTrayDelegateChromeOS> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTrayDelegateChromeOS);
 };
 
 ash::SystemTrayDelegate* CreateSystemTrayDelegate();
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_DELEGATE_CHROMEOS_H_