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

chrome/browser/extensions/extension_install_ui_browsertest.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 "base/command_line.h"
 #include "base/strings/string_util.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 179 matching lines @@
   } else {
     // TODO(xiyuan): Figure out how to test extension installed bubble?
   }
 }
 
 class NewTabUISortingBrowserTest : public ExtensionInstallUIBrowserTest,
                                    public content::NotificationObserver {
  public:
   NewTabUISortingBrowserTest() {}
 
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) override {
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override {
     if (type != chrome::NOTIFICATION_APP_LAUNCHER_REORDERED) {
       observer_->Observe(type, source, details);
       return;
     }
     const std::string* id = content::Details<const std::string>(details).ptr();
     EXPECT_TRUE(id);
     last_reordered_extension_id_ = *id;
   }
 
  protected:
@@ skipping 31 matching lines @@
   sorting->OnExtensionMoved(
       app_id, std::string(), extensions::kWebStoreAppId);
   EXPECT_EQ(app_id, last_reordered_extension_id_);
 
   // Now install the app.
   const extensions::Extension* test_app = LoadExtension(app_dir);
   ASSERT_TRUE(test_app);
   EXPECT_TRUE(service->GetInstalledExtension(app_id));
   EXPECT_EQ(app_id, test_app->id());
 }