Standardize usage of virtual/override/final in components/

components/omnibox/base_search_provider.h

Index: components/omnibox/base_search_provider.h
diff --git a/components/omnibox/base_search_provider.h b/components/omnibox/base_search_provider.h
index 0ec9d1de86a08c3e18dfb927e55966aa182c7548..a709e8c42d09d8f42087227e9cd241832f879ddd 100644
--- a/components/omnibox/base_search_provider.h
+++ b/components/omnibox/base_search_provider.h
@@ -69,8 +69,8 @@ class BaseSearchProvider : public AutocompleteProvider {
       const SearchTermsData& search_terms_data);
 
   // AutocompleteProvider:
-  virtual void DeleteMatch(const AutocompleteMatch& match) override;
-  virtual void AddProviderInfo(ProvidersInfo* provider_info) const override;
+  void DeleteMatch(const AutocompleteMatch& match) override;
+  void AddProviderInfo(ProvidersInfo* provider_info) const override;
 
   bool field_trial_triggered_in_session() const {
     return field_trial_triggered_in_session_;
@@ -97,7 +97,7 @@ class BaseSearchProvider : public AutocompleteProvider {
   static const char kTrue[];
   static const char kFalse[];
 
-  virtual ~BaseSearchProvider();
+  ~BaseSearchProvider() override;
 
   typedef std::pair<base::string16, std::string> MatchKey;
   typedef std::map<MatchKey, AutocompleteMatch> MatchMap;