[Sync] Make ModelSafeWorker a true interface

chrome/browser/sync/glue/sync_backend_registrar.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/sync/glue/sync_backend_registrar.h"
 
 #include <algorithm>
 #include <cstddef>
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/sync/engine/passive_model_worker.h"
 #include "chrome/browser/sync/glue/browser_thread_model_worker.h"
 #include "chrome/browser/sync/glue/change_processor.h"
 #include "chrome/browser/sync/glue/history_model_worker.h"
 #include "chrome/browser/sync/glue/password_model_worker.h"
 #include "chrome/browser/sync/glue/ui_model_worker.h"
 #include "content/public/browser/browser_thread.h"
 
 using content::BrowserThread;
 
 namespace browser_sync {
@@ skipping 34 matching lines @@
     profile_(profile),
     sync_loop_(sync_loop),
     ui_worker_(new UIModelWorker()),
     stopped_on_ui_thread_(false) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   CHECK(profile_);
   DCHECK(sync_loop_);
   workers_[GROUP_DB] = new DatabaseModelWorker();
   workers_[GROUP_FILE] = new FileModelWorker();
   workers_[GROUP_UI] = ui_worker_;
-  workers_[GROUP_PASSIVE] = new ModelSafeWorker();
+  workers_[GROUP_PASSIVE] = new PassiveModelWorker(sync_loop_);
 
   // Any datatypes that we want the syncer to pull down must be in the
   // routing_info map.  We set them to group passive, meaning that
   // updates will be applied to sync, but not dispatched to the native
   // models.
   for (syncable::ModelTypeSet::const_iterator it = initial_types.begin();
       it != initial_types.end(); ++it) {
     routing_info_[*it] = GROUP_PASSIVE;
   }
 
@@ skipping 205 matching lines @@
   return it->second;
 }
 
 bool SyncBackendRegistrar::IsCurrentThreadSafeForModel(
     syncable::ModelType model_type) const {
   lock_.AssertAcquired();
   return IsOnThreadForGroup(GetGroupForModelType(model_type, routing_info_));
 }
 
 }  // namespace browser_sync