Refactor preference syncing.

chrome/browser/ui/webui/ntp/shown_sections_handler.cc

 // 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.
 
 #include "chrome/browser/ui/webui/ntp/shown_sections_handler.h"
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/command_line.h"
@@ skipping 87 matching lines @@
     NotifySectionDisabled(mode, old_mode, web_ui_->GetProfile());
     pref_service_->SetInteger(prefs::kNTPShownSections, mode);
   }
 }
 
 // static
 void ShownSectionsHandler::RegisterUserPrefs(PrefService* pref_service) {
 #if defined(OS_CHROMEOS)
   // Default to have expanded APPS and all other sections are minimized.
   pref_service->RegisterIntegerPref(prefs::kNTPShownSections,
-                                    APPS | MENU_THUMB | MENU_RECENT);
+                                    APPS | MENU_THUMB | MENU_RECENT,
+                                    PrefService::UNSYNCABLE_PREF);
 #else
-  pref_service->RegisterIntegerPref(prefs::kNTPShownSections, THUMB);
+  pref_service->RegisterIntegerPref(prefs::kNTPShownSections,
+                                    THUMB,
+                                    PrefService::UNSYNCABLE_PREF);
 #endif
 }
 
 // static
 void ShownSectionsHandler::MigrateUserPrefs(PrefService* pref_service,
                                             int old_pref_version,
                                             int new_pref_version) {
   // Nothing to migrate for default kNTPShownSections value.
   const PrefService::Preference* shown_sections_pref =
       pref_service->FindPreference(prefs::kNTPShownSections);
@@ skipping 30 matching lines @@
 
     // Hide any open sections.
     mode &= ~ALL_SECTIONS_MASK;
 
     // Show the apps section.
     mode |= APPS;
 
     prefs->SetInteger(prefs::kNTPShownSections, mode);
   }
 }