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

chrome/browser/browsing_data/browsing_data_indexed_db_helper.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_BROWSING_DATA_BROWSING_DATA_INDEXED_DB_HELPER_H_
 #define CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_INDEXED_DB_HELPER_H_
 
 #include <list>
 #include <set>
 #include <string>
@@ skipping 97 matching lines @@
   bool empty() const;
 
   // Returns the number of currently stored indexed databases.
   size_t GetIndexedDBCount() const;
 
   // Returns the current list of indexed data bases.
   const std::set<CannedBrowsingDataIndexedDBHelper::PendingIndexedDBInfo>&
       GetIndexedDBInfo() const;
 
   // BrowsingDataIndexedDBHelper methods.
-  virtual void StartFetching(
-      const base::Callback<void(const std::list<content::IndexedDBInfo>&)>&
-          callback) override;
-  virtual void DeleteIndexedDB(const GURL& origin) override;
+  void StartFetching(const base::Callback<
+      void(const std::list<content::IndexedDBInfo>&)>& callback) override;
+  void DeleteIndexedDB(const GURL& origin) override;
 
  private:
-  virtual ~CannedBrowsingDataIndexedDBHelper();
+  ~CannedBrowsingDataIndexedDBHelper() override;
 
   std::set<PendingIndexedDBInfo> pending_indexed_db_info_;
 
   DISALLOW_COPY_AND_ASSIGN(CannedBrowsingDataIndexedDBHelper);
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_INDEXED_DB_HELPER_H_