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

chrome/browser/speech/extension_api/tts_engine_extension_observer.cc

 // Copyright 2014 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/speech/extension_api/tts_engine_extension_observer.h"
 
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "base/profiler/scoped_profile.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 24 matching lines @@
  private:
   friend struct DefaultSingletonTraits<TtsEngineExtensionObserverFactory>;
 
   TtsEngineExtensionObserverFactory()
       : BrowserContextKeyedServiceFactory(
             "TtsEngineExtensionObserver",
             BrowserContextDependencyManager::GetInstance()) {
     DependsOn(extensions::ExtensionSystemFactory::GetInstance());
   }
 
-  virtual ~TtsEngineExtensionObserverFactory() {}
+  ~TtsEngineExtensionObserverFactory() override {}
 
-  virtual content::BrowserContext* GetBrowserContextToUse(
+  content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const override {
     // If given an incognito profile (including the Chrome OS login
     // profile), share the service with the original profile.
     return chrome::GetBrowserContextRedirectedInIncognito(context);
   }
 
-  virtual KeyedService* BuildServiceInstanceFor(
+  KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* profile) const override {
     return new TtsEngineExtensionObserver(static_cast<Profile*>(profile));
   }
 };
 
 TtsEngineExtensionObserver* TtsEngineExtensionObserver::GetInstance(
     Profile* profile) {
   return TtsEngineExtensionObserverFactory::GetInstance()->GetForProfile(
       profile);
 }
@@ skipping 65 matching lines @@
 void TtsEngineExtensionObserver::OnExtensionUnloaded(
     content::BrowserContext* browser_context,
     const extensions::Extension* extension,
     extensions::UnloadedExtensionInfo::Reason reason) {
   if (engine_extension_ids_.find(extension->id()) !=
       engine_extension_ids_.end()) {
     engine_extension_ids_.erase(extension->id());
     TtsController::GetInstance()->VoicesChanged();
   }
 }