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

chrome/browser/chrome_browser_main.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/chrome_browser_main.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 491 matching lines @@
 
 // Heap allocated class that listens for first page load, kicks off stat
 // recording and then deletes itself.
 class LoadCompleteListener : public content::NotificationObserver {
  public:
   LoadCompleteListener() {
     registrar_.Add(this,
                    content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME,
                    content::NotificationService::AllSources());
   }
-  virtual ~LoadCompleteListener() {}
+  ~LoadCompleteListener() override {}
 
   // content::NotificationObserver implementation.
-  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 {
     DCHECK_EQ(content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME, type);
     startup_metric_utils::OnInitialPageLoadComplete();
     delete this;
   }
 
  private:
   content::NotificationRegistrar registrar_;
   DISALLOW_COPY_AND_ASSIGN(LoadCompleteListener);
 };
 
@@ skipping 1155 matching lines @@
   chromeos::CrosSettings::Shutdown();
 #endif
 #endif
 }
 
 // Public members:
 
 void ChromeBrowserMainParts::AddParts(ChromeBrowserMainExtraParts* parts) {
   chrome_extra_parts_.push_back(parts);
 }