Standardize usage of virtual/override/final in chrome/browser/history

chrome/browser/history/in_memory_history_backend.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // The InMemoryHistoryBackend is a wrapper around the in-memory URL database.
 // It maintains an in-memory cache of a subset of history that is required for
 // low-latency operations, such as in-line autocomplete.
 //
 // The in-memory cache provides the following guarantees:
 //  (1.) It will always contain URLRows that either have a |typed_count| > 0; or
@@ skipping 33 matching lines @@
 struct KeywordSearchDeletedDetails;
 class URLDatabase;
 class URLRow;
 struct URLsDeletedDetails;
 struct URLsModifiedDetails;
 
 class InMemoryHistoryBackend : public HistoryServiceObserver,
                                public content::NotificationObserver {
  public:
   InMemoryHistoryBackend();
-  virtual ~InMemoryHistoryBackend();
+  ~InMemoryHistoryBackend() override;
 
   // Initializes the backend from the history database pointed to by the
   // full path in |history_filename|.
   bool Init(const base::FilePath& history_filename);
 
   // Does initialization work when this object is attached to the history
   // system on the main thread. The argument is the profile with which the
   // attached history service is under.
   void AttachToHistoryService(Profile* profile,
                               HistoryService* history_service);
 
   // Deletes all search terms for the specified keyword.
   void DeleteAllSearchTermsForKeyword(KeywordID keyword_id);
 
   // Returns the underlying database associated with this backend. The current
   // autocomplete code was written fro this, but it should probably be removed
   // so that it can deal directly with this object, rather than the DB.
   InMemoryDatabase* db() const {
     return db_.get();
   }
 
   // HistoryServiceObserver:
-  virtual void OnURLVisited(HistoryService* history_service,
-                            ui::PageTransition transition,
-                            const URLRow& row,
-                            const RedirectList& redirects,
-                            base::Time visit_time) override;
+  void OnURLVisited(HistoryService* history_service,
+                    ui::PageTransition transition,
+                    const URLRow& row,
+                    const RedirectList& redirects,
+                    base::Time visit_time) override;
 
   // Notification callback.
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) override;
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest, DeleteAll);
 
   // Handler for HISTORY_URL_VISITED and HISTORY_URLS_MODIFIED.
   void OnURLVisitedOrModified(const URLRow& url_row);
 
   // Handler for HISTORY_URLS_DELETED.
   void OnURLsDeleted(const URLsDeletedDetails& details);
 
@@ skipping 11 matching lines @@
   // initialization.
   Profile* profile_;
   HistoryService* history_service_;
 
   DISALLOW_COPY_AND_ASSIGN(InMemoryHistoryBackend);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_IN_MEMORY_HISTORY_BACKEND_H_