Refactor preference syncing.

chrome/browser/ui/webui/ntp/new_tab_ui.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 "build/build_config.h"
 
 #include "chrome/browser/ui/webui/ntp/new_tab_ui.h"
 
 #include <set>
 
@@ skipping 443 matching lines @@
 }
 
 void NewTabUI::InitializeCSSCaches() {
   Profile* profile = GetProfile();
   ThemeSource* theme = new ThemeSource(profile);
   profile->GetChromeURLDataManager()->AddDataSource(theme);
 }
 
 // static
 void NewTabUI::RegisterUserPrefs(PrefService* prefs) {
-  prefs->RegisterIntegerPref(prefs::kNTPPrefVersion, 0);
+  prefs->RegisterIntegerPref(prefs::kNTPPrefVersion,
+                             0,
+                             PrefService::UNSYNCABLE_PREF);
 
   MostVisitedHandler::RegisterUserPrefs(prefs);
   ShownSectionsHandler::RegisterUserPrefs(prefs);
 
   UpdateUserPrefsVersion(prefs);
 }
 
 // static
 bool NewTabUI::UpdateUserPrefsVersion(PrefService* prefs) {
   const int old_pref_version = prefs->GetInteger(prefs::kNTPPrefVersion);
@@ skipping 149 matching lines @@
   SendResponse(request_id, html_bytes);
 }
 
 std::string NewTabUI::NewTabHTMLSource::GetMimeType(const std::string&) const {
   return "text/html";
 }
 
 bool NewTabUI::NewTabHTMLSource::ShouldReplaceExistingSource() const {
   return false;
 }