Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/net/net_pref_observer.cc

Index: chrome/browser/net/net_pref_observer.cc
diff --git a/chrome/browser/net/net_pref_observer.cc b/chrome/browser/net/net_pref_observer.cc
index 7517323ac9a7bd8e2729a244c48f55cbb328e263..2d60a79de531741450d243559ce0fe73730eb681 100644
--- a/chrome/browser/net/net_pref_observer.cc
+++ b/chrome/browser/net/net_pref_observer.cc
@@ -47,11 +47,11 @@ void NetPrefObserver::ApplySettings() {
 }
 
 // static
-void NetPrefObserver::RegisterPrefs(PrefService* prefs) {
+void NetPrefObserver::RegisterPrefs(PrefServiceSyncable* prefs) {
   prefs->RegisterBooleanPref(prefs::kNetworkPredictionEnabled,
                              true,
-                             PrefService::SYNCABLE_PREF);
+                             PrefServiceSyncable::SYNCABLE_PREF);
   prefs->RegisterBooleanPref(prefs::kDisableSpdy,
                              false,
-                             PrefService::UNSYNCABLE_PREF);
+                             PrefServiceSyncable::UNSYNCABLE_PREF);
 }