Remove PrefServiceSimple, replacing it with PrefService and PrefRegistrySimple.

chrome/browser/prefs/pref_service_syncable.cc

 // Copyright (c) 2012 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/prefs/pref_service_syncable.h"
 
 #include "base/bind.h"
 #include "base/file_path.h"
 #include "base/prefs/default_pref_store.h"
 #include "base/prefs/overlay_user_pref_store.h"
@@ skipping 245 matching lines @@
 }
 
 void PrefServiceSyncable::UpdateCommandLinePrefStore(
     PrefStore* cmd_line_store) {
   // If |pref_service_forked_| is true, then this PrefService and the forked
   // copies will be out of sync.
   DCHECK(!pref_service_forked_);
   PrefService::UpdateCommandLinePrefStore(cmd_line_store);
 }
 
+bool PrefServiceSyncable::AllowPrefRegistrarSimple() const {
+  return false;
+}
+
 void PrefServiceSyncable::OnIsSyncingChanged() {
   FOR_EACH_OBSERVER(PrefServiceObserver, observer_list_, OnIsSyncingChanged());
 }
 
 void PrefServiceSyncable::RegisterSyncablePreference(
     const char* path, Value* default_value, PrefSyncStatus sync_status) {
   PrefService::RegisterPreference(path, default_value);
   // Register with sync if necessary.
   if (sync_status == SYNCABLE_PREF)
     pref_sync_associator_.RegisterPref(path);
 }