Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/net/pref_proxy_config_tracker_impl.cc

Index: chrome/browser/net/pref_proxy_config_tracker_impl.cc
diff --git a/chrome/browser/net/pref_proxy_config_tracker_impl.cc b/chrome/browser/net/pref_proxy_config_tracker_impl.cc
index 69f9387800dfd7acedd3eaeba6e1f85b3f8c07ec..b8ee38b0a114a524e871146c1aed592c6f1c2869 100644
--- a/chrome/browser/net/pref_proxy_config_tracker_impl.cc
+++ b/chrome/browser/net/pref_proxy_config_tracker_impl.cc
@@ -196,11 +196,12 @@ net::ProxyConfigService::ConfigAvailability
 }
 
 // static
-void PrefProxyConfigTrackerImpl::RegisterPrefs(PrefService* pref_service) {
+void PrefProxyConfigTrackerImpl::RegisterPrefs(
+    PrefServiceSyncable* pref_service) {
   DictionaryValue* default_settings = ProxyConfigDictionary::CreateSystem();
   pref_service->RegisterDictionaryPref(prefs::kProxy,
                                        default_settings,
-                                       PrefService::UNSYNCABLE_PREF);
+                                       PrefServiceSyncable::UNSYNCABLE_PREF);
 }
 
 ProxyPrefs::ConfigState PrefProxyConfigTrackerImpl::GetProxyConfig(