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

chrome/browser/extensions/api/alarms/alarms_api_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.
 
 // This file tests the chrome.alarms extension API.
 
 #include "base/test/simple_test_clock.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/api/alarms/alarm_manager.h"
 #include "chrome/browser/extensions/api/alarms/alarms_api.h"
@@ skipping 12 matching lines @@
 
 namespace utils = extension_function_test_utils;
 
 namespace extensions {
 
 namespace {
 
 // Test delegate which quits the message loop when an alarm fires.
 class AlarmDelegate : public AlarmManager::Delegate {
  public:
-  virtual ~AlarmDelegate() {}
-  virtual void OnAlarm(const std::string& extension_id,
-                       const Alarm& alarm) override {
+  ~AlarmDelegate() override {}
+  void OnAlarm(const std::string& extension_id, const Alarm& alarm) override {
     alarms_seen.push_back(alarm.js_alarm->name);
     if (base::MessageLoop::current()->is_running())
       base::MessageLoop::current()->Quit();
   }
 
   std::vector<std::string> alarms_seen;
 };
 
 }  // namespace
 
@@ skipping 612 matching lines @@
 
   // The next poll should be the first poll that hasn't happened and is in-line
   // with the original scheduling.
   // Last poll was at 380 seconds; next poll should be at 480 seconds.
   EXPECT_DOUBLE_EQ((alarm_manager_->last_poll_time_ +
                        base::TimeDelta::FromSeconds(100)).ToJsTime(),
                    alarm_manager_->next_poll_time_.ToJsTime());
 }
 
 }  // namespace extensions