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

chrome/browser/extensions/api/alarms/alarm_manager.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 "chrome/browser/extensions/api/alarms/alarm_manager.h"
 
 #include "base/bind.h"
 #include "base/json/json_writer.h"
 #include "base/lazy_instance.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 21 matching lines @@
 
 // The minimum period between polling for alarms to run.
 const base::TimeDelta kDefaultMinPollPeriod() {
   return base::TimeDelta::FromDays(1);
 }
 
 class DefaultAlarmDelegate : public AlarmManager::Delegate {
  public:
   explicit DefaultAlarmDelegate(content::BrowserContext* context)
       : browser_context_(context) {}
-  virtual ~DefaultAlarmDelegate() {}
+  ~DefaultAlarmDelegate() override {}
 
-  virtual void OnAlarm(const std::string& extension_id,
-                       const Alarm& alarm) override {
+  void OnAlarm(const std::string& extension_id, const Alarm& alarm) override {
     scoped_ptr<base::ListValue> args(new base::ListValue());
     args->Append(alarm.js_alarm->ToValue().release());
     scoped_ptr<Event> event(new Event(alarms::OnAlarm::kEventName,
                                       args.Pass()));
     EventRouter::Get(browser_context_)
         ->DispatchEventToExtension(extension_id, event.Pass());
   }
 
  private:
   content::BrowserContext* browser_context_;
@@ skipping 406 matching lines @@
   if (create_info.period_in_minutes.get()) {
     js_alarm->period_in_minutes.reset(
         new double(*create_info.period_in_minutes));
   }
 }
 
 Alarm::~Alarm() {
 }
 
 }  // namespace extensions