[Profiles] Remove the NotificationService from the ProfileInfoCache

chrome/browser/ui/webui/ntp/ntp_login_handler.h

 // Copyright (c) 2011 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_WEBUI_NTP_NTP_LOGIN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_NTP_NTP_LOGIN_HANDLER_H_
 
 #include "base/prefs/pref_member.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
+#include "chrome/browser/profiles/profile_info_cache_observer.h"
 #include "content/public/browser/web_ui_message_handler.h"
 
 class Profile;
 
 // The NTP login handler currently simply displays the current logged in
 // username at the top of the NTP (and update itself when that changes).
 // In the future it may expand to allow users to login from the NTP.
 class NTPLoginHandler : public content::WebUIMessageHandler,
-                        public content::NotificationObserver {
+                        public ProfileInfoCacheObserver {
  public:
   NTPLoginHandler();
   ~NTPLoginHandler() override;
 
-  // WebUIMessageHandler interface
+  // WebUIMessageHandler implementation:
   void RegisterMessages() override;
 
-  // content::NotificationObserver interface
-  void Observe(int type,
-               const content::NotificationSource& source,
-               const content::NotificationDetails& details) override;
+  // ProfileInfoCacheObserver implementation:
+  void OnProfileUserNameChanged(const base::FilePath& profile_path) override;
 
   // Returns true if the login handler should be shown in a new tab page
   // for the given |profile|. |profile| must not be NULL.
   static bool ShouldShow(Profile* profile);
 
   // Registers values (strings etc.) for the page.
   static void GetLocalizedValues(Profile* profile,
                                  base::DictionaryValue* values);
 
  private:
@@ skipping 22 matching lines @@
 
   // Called from JS when the user clicks on the advanced link the sync promo NTP
   // bubble. Use use this to navigate to the sync settings page. |args| is the
   // list of arguments passed from JS and should be an empty list.
   void HandleShowAdvancedLoginUI(const base::ListValue* args);
 
   // Internal helper method
   void UpdateLogin();
 
   BooleanPrefMember signin_allowed_pref_;
-  content::NotificationRegistrar registrar_;
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_NTP_LOGIN_HANDLER_H_