Standardize usage of virtual/override/final in chrome/

chrome/test/base/history_index_restore_observer.h

Index: chrome/test/base/history_index_restore_observer.h
diff --git a/chrome/test/base/history_index_restore_observer.h b/chrome/test/base/history_index_restore_observer.h
index c03a385b8f026efa50f4499a3c0cb89557f7ad76..4d76aee2b5ab69e62aa2b607f3b5627f4ac5164c 100644
--- a/chrome/test/base/history_index_restore_observer.h
+++ b/chrome/test/base/history_index_restore_observer.h
@@ -17,12 +17,12 @@ class HistoryIndexRestoreObserver
     : public history::InMemoryURLIndex::RestoreCacheObserver {
  public:
   explicit HistoryIndexRestoreObserver(const base::Closure& task);
-  virtual ~HistoryIndexRestoreObserver();
+  ~HistoryIndexRestoreObserver() override;
 
   bool succeeded() const { return succeeded_; }
 
   // RestoreCacheObserver implementation.
-  virtual void OnCacheRestoreFinished(bool success) override;
+  void OnCacheRestoreFinished(bool success) override;
 
  private:
   base::Closure task_;