chromeos: Replace user image notifications with observer

chrome/browser/ui/webui/settings/profile_info_handler.cc

Index: chrome/browser/ui/webui/settings/profile_info_handler.cc
diff --git a/chrome/browser/ui/webui/settings/profile_info_handler.cc b/chrome/browser/ui/webui/settings/profile_info_handler.cc
index 2acd3c5944ae336f3c84a46018cea0d340921efd..ae1f85949c7cad890db3b935ab0fd9c9651067d6 100644
--- a/chrome/browser/ui/webui/settings/profile_info_handler.cc
+++ b/chrome/browser/ui/webui/settings/profile_info_handler.cc
@@ -63,8 +63,7 @@ void ProfileInfoHandler::OnJavascriptAllowed() {
                  base::Unretained(this)));
 
 #if defined(OS_CHROMEOS)
-  registrar_.Add(this, chrome::NOTIFICATION_LOGIN_USER_IMAGE_CHANGED,
-                 content::NotificationService::AllSources());
+  user_manager::UserManager::Get()->AddObserver(this);
 #endif
 }
 
@@ -75,15 +74,12 @@ void ProfileInfoHandler::OnJavascriptDisallowed() {
   profile_pref_registrar_.RemoveAll();
 
 #if defined(OS_CHROMEOS)
-  registrar_.RemoveAll();
+  user_manager::UserManager::Get()->RemoveObserver(this);
 #endif
 }
 
 #if defined(OS_CHROMEOS)
-void ProfileInfoHandler::Observe(int type,
-                                 const content::NotificationSource& source,
-                                 const content::NotificationDetails& details) {
-  DCHECK_EQ(chrome::NOTIFICATION_LOGIN_USER_IMAGE_CHANGED, type);
+void ProfileInfoHandler::OnUserImageChanged(const user_manager::User& user) {
   PushProfileInfo();
 }
 #endif