Standardize usage of virtual/override/final specifiers.

chrome/browser/background/background_application_list_model_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.
 
 // TODO(rickcam): Bug 73183: Add unit tests for image loading
 
 #include <cstdlib>
 #include <set>
 
 #include "chrome/browser/background/background_application_list_model.h"
@@ skipping 29 matching lines @@
 // For ExtensionService interface when it requires a path that is not used.
 base::FilePath bogus_file_pathname(const std::string& name) {
   return base::FilePath(FILE_PATH_LITERAL("//foobar_nonexistent"))
       .AppendASCII(name);
 }
 
 class BackgroundApplicationListModelTest
     : public extensions::ExtensionServiceTestBase {
  public:
   BackgroundApplicationListModelTest() {}
-  virtual ~BackgroundApplicationListModelTest() {}
+  ~BackgroundApplicationListModelTest() override {}
 
  protected:
   void InitializeAndLoadEmptyExtensionService() {
     InitializeEmptyExtensionService();
     service_->Init(); /* Sends EXTENSIONS_READY */
   }
 
   bool IsBackgroundApp(const Extension& app) {
     return BackgroundApplicationListModel::IsBackgroundApp(app,
                                                            profile_.get());
@@ skipping 522 matching lines @@
         break;
       case 2:
         TogglePermission(service, &extensions, model.get(), &expected, &count);
         break;
       default:
         NOTREACHED();
         break;
     }
   }
 }