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

chrome/browser/history/web_history_service.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_WEB_HISTORY_SERVICE_H_
 #define CHROME_BROWSER_HISTORY_WEB_HISTORY_SERVICE_H_
 
 #include <set>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 33 matching lines @@
 
   // Callback with the result of a call to QueryHistory(). Currently, the
   // DictionaryValue is just the parsed JSON response from the server.
   // TODO(dubroy): Extract the DictionaryValue into a structured results object.
   typedef base::Callback<void(Request*, const base::DictionaryValue*)>
       QueryWebHistoryCallback;
 
   typedef base::Callback<void(bool success)> ExpireWebHistoryCallback;
 
   explicit WebHistoryService(Profile* profile);
-  virtual ~WebHistoryService();
+  ~WebHistoryService() override;
 
   // Searches synced history for visits matching |text_query|. The timeframe to
   // search, along with other options, is specified in |options|. If
   // |text_query| is empty, all visits in the timeframe will be returned.
   // This method is the equivalent of HistoryService::QueryHistory.
   // The caller takes ownership of the returned Request. If it is destroyed, the
   // request is cancelled.
   scoped_ptr<Request> QueryHistory(
       const base::string16& text_query,
       const QueryOptions& options,
@@ skipping 40 matching lines @@
   std::set<Request*> pending_expire_requests_;
 
   base::WeakPtrFactory<WebHistoryService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebHistoryService);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_WEB_HISTORY_SERVICE_H_