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

chrome/browser/autocomplete/shortcuts_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_AUTOCOMPLETE_SHORTCUTS_BACKEND_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_SHORTCUTS_BACKEND_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 73 matching lines @@
 
   enum CurrentState {
     NOT_INITIALIZED,  // Backend created but not initialized.
     INITIALIZING,     // Init() called, but not completed yet.
     INITIALIZED,      // Initialization completed, all accessors can be safely
                       // called.
   };
 
   typedef std::map<std::string, ShortcutMap::iterator> GuidMap;
 
-  virtual ~ShortcutsBackend();
+  ~ShortcutsBackend() override;
 
   static history::ShortcutsDatabase::Shortcut::MatchCore MatchToMatchCore(
       const AutocompleteMatch& match, Profile* profile);
 
   // RefcountedKeyedService:
-  virtual void ShutdownOnUIThread() override;
+  void ShutdownOnUIThread() override;
 
   // content::NotificationObserver:
-  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;
 
   // Internal initialization of the back-end. Posted by Init() to the DB thread.
   // On completion posts InitCompleted() back to UI thread.
   void InitInternal();
 
   // Finishes initialization on UI thread, notifies all observers.
   void InitCompleted();
 
   // Adds the Shortcut to the database.
   bool AddShortcut(const history::ShortcutsDatabase::Shortcut& shortcut);
@@ skipping 29 matching lines @@
 
   content::NotificationRegistrar notification_registrar_;
 
   // For some unit-test only.
   bool no_db_access_;
 
   DISALLOW_COPY_AND_ASSIGN(ShortcutsBackend);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_SHORTCUTS_BACKEND_H_