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

chrome/browser/android/most_visited_sites.h

Index: chrome/browser/android/most_visited_sites.h
diff --git a/chrome/browser/android/most_visited_sites.h b/chrome/browser/android/most_visited_sites.h
index b01c56ecfeec92f4d5eeaf3241ba4284962bea51..6e5a7f52a5663b1eb2fca8aab909c821c18b8a42 100644
--- a/chrome/browser/android/most_visited_sites.h
+++ b/chrome/browser/android/most_visited_sites.h
@@ -45,7 +45,7 @@ class MostVisitedSites : public ProfileSyncServiceObserver,
   void RecordOpenedMostVisitedItem(JNIEnv* env, jobject obj, jint index);
 
   // ProfileSyncServiceObserver implementation.
-  virtual void OnStateChanged() override;
+  void OnStateChanged() override;
 
   // Registers JNI methods.
   static bool Register(JNIEnv* env);
@@ -57,7 +57,7 @@ class MostVisitedSites : public ProfileSyncServiceObserver,
     SUGGESTIONS_SERVICE
   };
 
-  virtual ~MostVisitedSites();
+  ~MostVisitedSites() override;
   void QueryMostVisitedURLs();
 
   // Initialize the query to Top Sites. Called if the SuggestionsService is not