Update {virtual,override,final} to follow C++11 style.

chrome/browser/android/logo_service.h

Index: chrome/browser/android/logo_service.h
diff --git a/chrome/browser/android/logo_service.h b/chrome/browser/android/logo_service.h
index fe4075b07f9ad848361d450568344a1854c8be39..441c6e21b188bd670d5883c4d18968f7abc0c657 100644
--- a/chrome/browser/android/logo_service.h
+++ b/chrome/browser/android/logo_service.h
@@ -22,7 +22,7 @@ class Profile;
 class LogoService : public KeyedService {
  public:
   explicit LogoService(Profile* profile);
-  virtual ~LogoService();
+  ~LogoService() override;
 
   // Gets the logo for the default search provider and notifies |observer|
   // with the results.
@@ -46,10 +46,10 @@ class LogoServiceFactory : public BrowserContextKeyedServiceFactory {
   friend struct DefaultSingletonTraits<LogoServiceFactory>;
 
   LogoServiceFactory();
-  virtual ~LogoServiceFactory();
+  ~LogoServiceFactory() override;
 
   // BrowserContextKeyedServiceFactory:
-  virtual KeyedService* BuildServiceInstanceFor(
+  KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* context) const override;
 };