cros: Fix user image change crash

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 60f91128272a4d01d4fc538b3374957207592771..4ce53d7c5d77f6fea4e555f9519bf2d89cf6eb7a 100644
--- a/chrome/browser/ui/webui/settings/profile_info_handler.cc
+++ b/chrome/browser/ui/webui/settings/profile_info_handler.cc
@@ -41,6 +41,9 @@ const char ProfileInfoHandler::kProfileStatsCountReadyEventName[] =
 
 ProfileInfoHandler::ProfileInfoHandler(Profile* profile)
     : profile_(profile),
+#if defined(OS_CHROMEOS)
+      user_manager_observer_(this),
+#endif
       profile_observer_(this) {
 #if defined(OS_CHROMEOS)
   // Set up the chrome://userimage/ source.
@@ -79,7 +82,7 @@ void ProfileInfoHandler::OnJavascriptAllowed() {
                  base::Unretained(this)));
 
 #if defined(OS_CHROMEOS)
-  user_manager::UserManager::Get()->AddObserver(this);
+  user_manager_observer_.Add(user_manager::UserManager::Get());
 #endif
 }
 
@@ -90,7 +93,7 @@ void ProfileInfoHandler::OnJavascriptDisallowed() {
   profile_pref_registrar_.RemoveAll();
 
 #if defined(OS_CHROMEOS)
-  user_manager::UserManager::Get()->RemoveObserver(this);
+  user_manager_observer_.Remove(user_manager::UserManager::Get());
 #endif
 }