Standardize usage of virtual/override/final in chrome/browser/sync/

chrome/browser/sync/glue/sync_backend_registrar_unittest.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/sync/glue/sync_backend_registrar.h"
 
 #include "chrome/browser/sync/glue/ui_model_worker.h"
 #include "chrome/test/base/testing_profile.h"
 #include "components/sync_driver/change_processor_mock.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 273 matching lines @@
 };
 
 // Wrap SyncBackendRegistrar so that we can monitor its lifetime.
 class TestRegistrar : public SyncBackendRegistrar {
  public:
   explicit TestRegistrar(Profile* profile,
                          SyncBackendRegistrarShutdownTest* test)
       : SyncBackendRegistrar("test", profile, scoped_ptr<base::Thread>()),
         test_(test) {}
 
-  virtual ~TestRegistrar() { test_->registrar_destroyed_.Signal(); }
+  ~TestRegistrar() override { test_->registrar_destroyed_.Signal(); }
 
  private:
   SyncBackendRegistrarShutdownTest* test_;
 };
 
 TEST_F(SyncBackendRegistrarShutdownTest, BlockingShutdown) {
   // Take ownership of |db_thread_lock_| so that the DB thread can't acquire it.
   db_thread_lock_.Acquire();
 
   // This will block the DB thread by waiting on |db_thread_lock_|.
@@ skipping 32 matching lines @@
   base::MessageLoop::current()->RunUntilIdle();
 
   // This verifies that all workers have been removed and the registrar
   // destroyed.
   registrar_destroyed_.Wait();
 }
 
 }  // namespace
 
 }  // namespace browser_sync