Refactor preference syncing.

chrome/browser/ui/webui/shown_sections_handler.cc

Index: chrome/browser/ui/webui/shown_sections_handler.cc
diff --git a/chrome/browser/ui/webui/shown_sections_handler.cc b/chrome/browser/ui/webui/shown_sections_handler.cc
index c8811c30ae649ab1df2f5f137fd5a7d170e94963..63635295764594785892026a01d2383382438609 100644
--- a/chrome/browser/ui/webui/shown_sections_handler.cc
+++ b/chrome/browser/ui/webui/shown_sections_handler.cc
@@ -107,9 +107,12 @@ 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,
+                                    false /* don't sync pref */);
 #else
-  pref_service->RegisterIntegerPref(prefs::kNTPShownSections, THUMB);
+  pref_service->RegisterIntegerPref(prefs::kNTPShownSections,
+                                    THUMB,
+                                    false /* don't sync pref */);
 #endif
 }