Refactor preference syncing.

chrome/browser/policy/cloud_policy_subsystem.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/policy/cloud_policy_subsystem.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 127 matching lines @@
     CloudPolicySubsystem::GetRecommendedPolicyProvider() {
   if (cloud_policy_cache_.get())
     return cloud_policy_cache_->GetRecommendedPolicyProvider();
 
   return NULL;
 }
 
 // static
 void CloudPolicySubsystem::RegisterPrefs(PrefService* pref_service) {
   pref_service->RegisterIntegerPref(prefs::kPolicyRefreshRate,
-                                    kDefaultPolicyRefreshRateMs);
+                                    kDefaultPolicyRefreshRateMs,
+                                    PrefService::UNSYNCABLE_PREF);
 }
 
 void CloudPolicySubsystem::UpdatePolicyRefreshRate() {
   if (cloud_policy_controller_.get()) {
     // Clamp to sane values.
     int64 refresh_rate = policy_refresh_rate_.GetValue();
     refresh_rate = std::max(kPolicyRefreshRateMinMs, refresh_rate);
     refresh_rate = std::min(kPolicyRefreshRateMaxMs, refresh_rate);
     cloud_policy_controller_->SetRefreshRate(refresh_rate);
   }
 }
 
 void CloudPolicySubsystem::Observe(NotificationType type,
                                    const NotificationSource& source,
                                    const NotificationDetails& details) {
   if (type == NotificationType::PREF_CHANGED &&
       policy_refresh_rate_.GetPrefName() ==
           *(Details<std::string>(details).ptr()) &&
       prefs_ == Source<PrefService>(source).ptr()) {
     UpdatePolicyRefreshRate();
   } else {
     NOTREACHED();
   }
 }
 
 }  // namespace policy