Standardize usage of virtual/override/final in components/

components/search_engines/keyword_web_data_service.h

 // Copyright 2014 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 COMPONENTS_SEARCH_ENGINES_KEYWORD_WEB_DATA_SERVICE_H__
 #define COMPONENTS_SEARCH_ENGINES_KEYWORD_WEB_DATA_SERVICE_H__
 
 #include "base/memory/ref_counted.h"
 #include "components/search_engines/keyword_table.h"
 #include "components/search_engines/template_url_id.h"
@@ skipping 64 matching lines @@
   // On success, consumer is notified with WDResult<KeywordTable::Keywords>.
   Handle GetKeywords(WebDataServiceConsumer* consumer);
 
   // Sets the ID of the default search provider.
   void SetDefaultSearchProviderID(TemplateURLID id);
 
   // Sets the version of the builtin keywords.
   void SetBuiltinKeywordVersion(int version);
 
  protected:
-  virtual ~KeywordWebDataService();
+  ~KeywordWebDataService() override;
 
  private:
   // Called by the BatchModeScoper (see comments there).
   void AdjustBatchModeLevel(bool entering_batch_mode);
 
   //////////////////////////////////////////////////////////////////////////////
   //
   // The following methods are only invoked on the DB thread.
   //
   //////////////////////////////////////////////////////////////////////////////
   WebDatabase::State PerformKeywordOperationsImpl(
       const KeywordTable::Operations& operations,
       WebDatabase* db);
   scoped_ptr<WDTypedResult> GetKeywordsImpl(WebDatabase* db);
   WebDatabase::State SetDefaultSearchProviderIDImpl(TemplateURLID id,
                                                     WebDatabase* db);
   WebDatabase::State SetBuiltinKeywordVersionImpl(int version, WebDatabase* db);
 
   size_t batch_mode_level_;
   KeywordTable::Operations queued_keyword_operations_;
 
   DISALLOW_COPY_AND_ASSIGN(KeywordWebDataService);
 };
 
 #endif  // COMPONENTS_SEARCH_ENGINES_KEYWORD_WEB_DATA_SERVICE_H__