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

chrome/browser/task_manager/task_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/task_manager/task_manager.h"
 
 #include "base/bind.h"
 #include "base/i18n/number_formatting.h"
 #include "base/i18n/rtl.h"
 #include "base/prefs/pref_registry_simple.h"
@@ skipping 147 matching lines @@
 
 }  // namespace
 
 class TaskManagerModelGpuDataManagerObserver
     : public content::GpuDataManagerObserver {
  public:
   TaskManagerModelGpuDataManagerObserver() {
     content::GpuDataManager::GetInstance()->AddObserver(this);
   }
 
-  virtual ~TaskManagerModelGpuDataManagerObserver() {
+  ~TaskManagerModelGpuDataManagerObserver() override {
     content::GpuDataManager::GetInstance()->RemoveObserver(this);
   }
 
   static void NotifyVideoMemoryUsageStats(
       const content::GPUVideoMemoryUsageStats& video_memory_usage_stats) {
     TaskManager::GetInstance()->model()->NotifyVideoMemoryUsageStats(
         video_memory_usage_stats);
   }
 
-  virtual void OnVideoMemoryUsageStatsUpdate(
-      const content::GPUVideoMemoryUsageStats& video_memory_usage_stats)
-          override {
+  void OnVideoMemoryUsageStatsUpdate(const content::GPUVideoMemoryUsageStats&
+                                         video_memory_usage_stats) override {
     if (BrowserThread::CurrentlyOn(BrowserThread::UI)) {
       NotifyVideoMemoryUsageStats(video_memory_usage_stats);
     } else {
       BrowserThread::PostTask(
           BrowserThread::UI, FROM_HERE, base::Bind(
               &TaskManagerModelGpuDataManagerObserver::
                   NotifyVideoMemoryUsageStats,
               video_memory_usage_stats));
     }
   }
@@ skipping 1344 matching lines @@
   params.host_desktop_type = desktop_type;
   chrome::Navigate(&params);
 }
 
 TaskManager::TaskManager()
     : model_(new TaskManagerModel(this)) {
 }
 
 TaskManager::~TaskManager() {
 }