ntp: remove ShownSectionHandler and all references to it

chrome/browser/ui/webui/ntp/new_tab_ui.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_NEW_TAB_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_UI_H_
 #pragma once
 
 #include <string>
 
@@ skipping 17 matching lines @@
  public:
   explicit NewTabUI(TabContents* manager);
   virtual ~NewTabUI();
 
   // Override WebUI methods so we can hook up the paint timer to the render
   // view host.
   virtual void RenderViewCreated(RenderViewHost* render_view_host) OVERRIDE;
   virtual void RenderViewReused(RenderViewHost* render_view_host) OVERRIDE;
 
   static void RegisterUserPrefs(PrefService* prefs);
-  static void MigrateUserPrefs(PrefService* prefs, int old_pref_version,
-                               int new_pref_version);
 
   // Adds "url", "title", and "direction" keys on incoming dictionary, setting
   // title as the url as a fallback on empty title.
   static void SetURLTitleAndDirection(base::DictionaryValue* dictionary,
                                       const string16& title,
                                       const GURL& gurl);
 
   // The current preference version.
   static int current_pref_version() { return current_pref_version_; }
 
@@ skipping 32 matching lines @@
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details);
 
   // Reset the CSS caches.
   void InitializeCSSCaches();
 
   void StartTimingPaint(RenderViewHost* render_view_host);
   void PaintTimeout();
 
-  // Updates the user prefs version and calls |MigrateUserPrefs| if needed.
-  // Returns true if the version was updated.
-  static bool UpdateUserPrefsVersion(PrefService* prefs);
-
   // Overridden from ChromeWebUI. Determines if the bookmarks bar can be shown
   // detached from the location bar.
   virtual bool CanShowBookmarkBar() const OVERRIDE;
 
   content::NotificationRegistrar registrar_;
 
   // Tracks updates of the kShowBookmarkBar preference.
   PrefChangeRegistrar pref_change_registrar_;
   // The time when we started benchmarking.
   base::TimeTicks start_;
   // The last time we got a paint notification.
   base::TimeTicks last_paint_;
   // Scoping so we can be sure our timeouts don't outlive us.
   base::OneShotTimer<NewTabUI> timer_;
   // The preference version. This used for migrating prefs of the NTP.
   static const int current_pref_version_ = 3;
 
   DISALLOW_COPY_AND_ASSIGN(NewTabUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_UI_H_