NTP: Allow hiding tips and bookmark sync....

chrome/browser/dom_ui/shown_sections_handler.h

 // Copyright (c) 2006-2009 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_DOM_UI_SHOWN_SECTIONS_HANDLER_H_
 #define CHROME_BROWSER_DOM_UI_SHOWN_SECTIONS_HANDLER_H_
 
 #include "chrome/browser/dom_ui/dom_ui.h"
 
 class DOMUI;
 class Value;
 class PrefService;
 
 // Use for the shown sections bitmask.
 enum Section {
   THUMB = 1,
   LIST = 2,
   RECENT = 4,
-  TIPS = 8
+  TIPS = 8,
+  SYNC = 16
 };
 
 class ShownSectionsHandler : public DOMMessageHandler {
  public:
   ShownSectionsHandler() {}
   virtual ~ShownSectionsHandler() {}
 
   // DOMMessageHandler implementation.
   virtual void RegisterMessages();
 
   // Callback for "getShownSections" message.
   void HandleGetShownSections(const Value* value);
 
   // Callback for "setShownSections" message.
   void HandleSetShownSections(const Value* value);
 
   static void RegisterUserPrefs(PrefService* prefs);
 
+  static void MigrateUserPrefs(PrefService* prefs, int old_pref_version,
+                               int new_pref_version);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(ShownSectionsHandler);
 };
 
 #endif  // CHROME_BROWSER_DOM_UI_SHOWN_SECTIONS_HANDLER_H_