Standardize usage of virtual/override/final in components/

components/invalidation/profile_invalidation_provider.h

Index: components/invalidation/profile_invalidation_provider.h
diff --git a/components/invalidation/profile_invalidation_provider.h b/components/invalidation/profile_invalidation_provider.h
index ef73f121e5284edb35551ed752e3aaa1eed710de..8277926e8509c9eb79346af0d10bdebda8039aaf 100644
--- a/components/invalidation/profile_invalidation_provider.h
+++ b/components/invalidation/profile_invalidation_provider.h
@@ -19,12 +19,12 @@ class ProfileInvalidationProvider : public KeyedService {
  public:
   explicit ProfileInvalidationProvider(
       scoped_ptr<InvalidationService> invalidation_service);
-  virtual ~ProfileInvalidationProvider();
+  ~ProfileInvalidationProvider() override;
 
   InvalidationService* GetInvalidationService();
 
   // KeyedService:
-  virtual void Shutdown() override;
+  void Shutdown() override;
 
  private:
   scoped_ptr<InvalidationService> invalidation_service_;