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

chrome/browser/extensions/api/notifications/notifications_apitest.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/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/api/notifications/notifications_api.h"
 #include "chrome/browser/extensions/extension_apitest.h"
@@ skipping 22 matching lines @@
 // A class that waits for a |chrome.test.sendMessage| call, ignores the message,
 // and writes down the user gesture status of the message.
 class UserGestureCatcher : public content::NotificationObserver {
  public:
   UserGestureCatcher() : waiting_(false) {
     registrar_.Add(this,
                    extensions::NOTIFICATION_EXTENSION_TEST_MESSAGE,
                    content::NotificationService::AllSources());
   }
 
-  virtual ~UserGestureCatcher() {}
+  ~UserGestureCatcher() override {}
 
   bool GetNextResult() {
     if (results_.empty()) {
       waiting_ = true;
       content::RunMessageLoop();
       waiting_ = false;
     }
 
     if (!results_.empty()) {
       bool ret = results_.front();
       results_.pop_front();
       return ret;
     }
     NOTREACHED();
     return false;
   }
 
  private:
-  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 {
     results_.push_back(
         static_cast<content::Source<extensions::TestSendMessageFunction> >(
             source)
             .ptr()
             ->user_gesture());
     if (waiting_)
       base::MessageLoopForUI::current()->Quit();
   }
 
   content::NotificationRegistrar registrar_;
@@ skipping 205 matching lines @@
     notification->ButtonClick(0);
     EXPECT_TRUE(catcher.GetNextResult());
     notification->Click();
     EXPECT_TRUE(catcher.GetNextResult());
     notification->Close(true);
     EXPECT_TRUE(catcher.GetNextResult());
     notification->Close(false);
     EXPECT_FALSE(catcher.GetNextResult());
   }
 }