[Sync] Refactor ModelSafeWorker::DoWorkAndWaitUntilDone() to avoid code duplication.

components/password_manager/sync/browser/password_model_worker.h

 // Copyright (c) 2015 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.
 
 #ifndef COMPONENTS_PASSWORD_MANAGER_SYNC_BROWSER_PASSWORD_MODEL_WORKER_H_
 #define COMPONENTS_PASSWORD_MANAGER_SYNC_BROWSER_PASSWORD_MODEL_WORKER_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "components/sync/engine/model_safe_worker.h"
@@ skipping 10 matching lines @@
 class PasswordModelWorker : public syncer::ModelSafeWorker {
  public:
   PasswordModelWorker(
       const scoped_refptr<password_manager::PasswordStore>& password_store);
 
   // syncer::ModelSafeWorker implementation.
   syncer::ModelSafeGroup GetModelSafeGroup() override;
   bool IsOnModelThread() override;
   void RequestStop() override;
 
- protected:
-  syncer::SyncerError DoWorkAndWaitUntilDoneImpl(
-      const syncer::WorkCallback& work) override;
-
  private:
   ~PasswordModelWorker() override;
 
+  void ScheduleWork(base::OnceClosure work) override;
+
   // |password_store_| is used on password thread but released on UI thread.
   // Protected by |password_store_lock_|.
   base::Lock password_store_lock_;
   scoped_refptr<password_manager::PasswordStore> password_store_;
   DISALLOW_COPY_AND_ASSIGN(PasswordModelWorker);
 };
 
 }  // namespace browser_sync
 
 #endif  // COMPONENTS_PASSWORD_MANAGER_SYNC_BROWSER_PASSWORD_MODEL_WORKER_H_