Refactor preference syncing.

chrome/browser/background_page_tracker.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/background_page_tracker.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 23 matching lines @@
 //
 // kKnownBackgroundPages:
 //    DictionaryValue {
 //       <appid_1>: false,
 //       <appid_2>: true,
 //         ... etc ...
 //    }
 
 // static
 void BackgroundPageTracker::RegisterPrefs(PrefService* prefs) {
-  prefs->RegisterDictionaryPref(prefs::kKnownBackgroundPages);
+  prefs->RegisterDictionaryPref(prefs::kKnownBackgroundPages,
+                                false /* don't sync pref */);
 }
 
 // static
 BackgroundPageTracker* BackgroundPageTracker::GetInstance() {
   return Singleton<BackgroundPageTracker>::get();
 }
 
 int BackgroundPageTracker::GetBackgroundPageCount() {
   if (!IsEnabled())
     return 0;
@@ skipping 237 matching lines @@
   prefs->ScheduleSavePersistentPrefs();
   SendChangeNotification();
 }
 
 void BackgroundPageTracker::SendChangeNotification() {
   NotificationService::current()->Notify(
       NotificationType::BACKGROUND_PAGE_TRACKER_CHANGED,
       Source<BackgroundPageTracker>(this),
       NotificationService::NoDetails());
 }