Standardize usage of virtual/override/final in components/

components/omnibox/base_search_provider.cc

Index: components/omnibox/base_search_provider.cc
diff --git a/components/omnibox/base_search_provider.cc b/components/omnibox/base_search_provider.cc
index 5f054ad94ebee27fbd56efeb9bee8714230ed02f..cb3654c2b9a1200d9e3635aee8ba02875ce6a9ed 100644
--- a/components/omnibox/base_search_provider.cc
+++ b/components/omnibox/base_search_provider.cc
@@ -36,11 +36,11 @@ class SuggestionDeletionHandler : public net::URLFetcherDelegate {
       net::URLRequestContextGetter* request_context,
       const DeletionCompletedCallback& callback);
 
-  virtual ~SuggestionDeletionHandler();
+  ~SuggestionDeletionHandler() override;
 
  private:
   // net::URLFetcherDelegate:
-  virtual void OnURLFetchComplete(const net::URLFetcher* source) override;
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
 
   scoped_ptr<net::URLFetcher> deletion_fetcher_;
   DeletionCompletedCallback callback_;