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

chrome/browser/drive/drive_app_registry_unittest.cc

 // Copyright 2014 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/drive/drive_app_registry.h"
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "base/values.h"
 #include "chrome/browser/drive/drive_app_registry_observer.h"
 #include "chrome/browser/drive/fake_drive_service.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "google_apis/drive/drive_api_parser.h"
 #include "google_apis/drive/gdata_wapi_parser.h"
 #include "google_apis/drive/test_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace drive {
 
 class TestDriveAppRegistryObserver : public DriveAppRegistryObserver {
  public:
   explicit TestDriveAppRegistryObserver(DriveAppRegistry* registry)
       : registry_(registry),
         update_count_(0) {
     registry_->AddObserver(this);
   }
-  virtual ~TestDriveAppRegistryObserver() {
-    registry_->RemoveObserver(this);
-  }
+  ~TestDriveAppRegistryObserver() override { registry_->RemoveObserver(this); }
 
   int update_count() const { return update_count_; }
 
  private:
   // DriveAppRegistryObserver overrides:
-  virtual void OnDriveAppRegistryUpdated() override { ++update_count_; }
+  void OnDriveAppRegistryUpdated() override { ++update_count_; }
 
   DriveAppRegistry* registry_;
   int update_count_;
   DISALLOW_COPY_AND_ASSIGN(TestDriveAppRegistryObserver);
 };
 
 class DriveAppRegistryTest : public testing::Test {
  protected:
   virtual void SetUp() override {
     fake_drive_service_.reset(new FakeDriveService);
@@ skipping 171 matching lines @@
       google_apis::test_util::CreateCopyResultCallback(&error));
   base::RunLoop().RunUntilIdle();
   EXPECT_EQ(error, google_apis::HTTP_NOT_FOUND);
 
   // Check that the number is not changed this time.
   apps_registry_->GetAppList(&apps);
   EXPECT_EQ(original_count - 1, apps.size());
 }
 
 }  // namespace drive