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

chrome/browser/history/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.
 
 #ifndef CHROME_BROWSER_HISTORY_HISTORY_BACKEND_H_
 #define CHROME_BROWSER_HISTORY_HISTORY_BACKEND_H_
 
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 499 matching lines @@
 
   // Returns true if the passed visit time is already expired (used by the sync
   // code to avoid syncing visits that would immediately be expired).
   virtual bool IsExpiredVisitTime(const base::Time& time);
 
   base::Time GetFirstRecordedTimeForTest() {
     return first_recorded_time_;
   }
 
  protected:
-  virtual ~HistoryBackend();
+  ~HistoryBackend() override;
 
   // Notify HistoryBackendObserver that |transition| to |row| occurred at
   // |visit_time| following |redirects| (empty if there is no redirects).
   void NotifyURLVisited(ui::PageTransition transition,
                         const URLRow& row,
                         const RedirectList& redirects,
                         base::Time visit_time);
 
  private:
   friend class base::RefCountedThreadSafe<HistoryBackend>;
@@ skipping 257 matching lines @@
   // redirects.
   void SendFaviconChangedNotificationForPageAndRedirects(
       const GURL& page_url);
 
   // Generic stuff -------------------------------------------------------------
 
   // Processes the next scheduled HistoryDBTask, scheduling this method
   // to be invoked again if there are more tasks that need to run.
   void ProcessDBTaskImpl();
 
-  virtual void BroadcastNotifications(
-      int type,
-      scoped_ptr<HistoryDetails> details) override;
-  virtual void NotifySyncURLsModified(URLRows* rows) override;
-  virtual void NotifySyncURLsDeleted(bool all_history,
-                                     bool expired,
-                                     URLRows* rows) override;
+  void BroadcastNotifications(int type,
+                              scoped_ptr<HistoryDetails> details) override;
+  void NotifySyncURLsModified(URLRows* rows) override;
+  void NotifySyncURLsDeleted(bool all_history,
+                             bool expired,
+                             URLRows* rows) override;
 
   // Deleting all history ------------------------------------------------------
 
   // Deletes all history. This is a special case of deleting that is separated
   // from our normal dependency-following method for performance reasons. The
   // logic lives here instead of ExpireHistoryBackend since it will cause
   // re-initialization of some databases (e.g. Thumbnails) that could fail.
   // When these databases are not valid, our pointers must be NULL, so we need
   // to handle this type of operation to keep the pointers in sync.
   void DeleteAllHistory();
@@ skipping 105 matching lines @@
 
   // List of observers
   ObserverList<HistoryBackendObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryBackend);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_BACKEND_H_