Standardize usage of virtual/override/final in sync/

sync/test/engine/fake_model_worker.h

 // 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.
 
 #ifndef SYNC_TEST_ENGINE_FAKE_MODEL_WORKER_H_
 #define SYNC_TEST_ENGINE_FAKE_MODEL_WORKER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/threading/non_thread_safe.h"
 #include "sync/internal_api/public/engine/model_safe_worker.h"
 #include "sync/internal_api/public/util/syncer_error.h"
 
 namespace syncer {
 
 // Fake implementation of ModelSafeWorker that does work on the
 // current thread regardless of the group.
 class FakeModelWorker : public ModelSafeWorker, public base::NonThreadSafe {
  public:
   explicit FakeModelWorker(ModelSafeGroup group);
 
   // ModelSafeWorker implementation.
-  virtual void RegisterForLoopDestruction() override;
-  virtual ModelSafeGroup GetModelSafeGroup() override;
+  void RegisterForLoopDestruction() override;
+  ModelSafeGroup GetModelSafeGroup() override;
 
  protected:
-  virtual SyncerError DoWorkAndWaitUntilDoneImpl(
-      const WorkCallback& work) override;
+  SyncerError DoWorkAndWaitUntilDoneImpl(const WorkCallback& work) override;
 
  private:
-  virtual ~FakeModelWorker();
+  ~FakeModelWorker() override;
 
   const ModelSafeGroup group_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeModelWorker);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_TEST_ENGINE_FAKE_MODEL_WORKER_H_