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

chrome/browser/browsing_data/mock_browsing_data_database_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_MOCK_BROWSING_DATA_DATABASE_HELPER_H_
 #define CHROME_BROWSER_BROWSING_DATA_MOCK_BROWSING_DATA_DATABASE_HELPER_H_
 
 #include <list>
 #include <map>
 #include <string>
 
 #include "base/callback.h"
 #include "chrome/browser/browsing_data/browsing_data_database_helper.h"
 
 // Mock for BrowsingDataDatabaseHelper.
 // Use AddDatabaseSamples() or add directly to response_ list, then call
 // Notify().
 class MockBrowsingDataDatabaseHelper : public BrowsingDataDatabaseHelper {
  public:
   explicit MockBrowsingDataDatabaseHelper(Profile* profile);
 
-  virtual void StartFetching(
-      const base::Callback<void(const std::list<DatabaseInfo>&)>& callback)
-          override;
+  void StartFetching(const base::Callback<void(const std::list<DatabaseInfo>&)>&
+                         callback) override;
 
-  virtual void DeleteDatabase(const std::string& origin,
-      const std::string& name) override;
+  void DeleteDatabase(const std::string& origin,
+                      const std::string& name) override;
 
   // Adds some DatabaseInfo samples.
   void AddDatabaseSamples();
 
   // Notifies the callback.
   void Notify();
 
   // Marks all databases as existing.
   void Reset();
 
   // Returns true if all databases since the last Reset() invokation were
   // deleted.
   bool AllDeleted();
 
   std::string last_deleted_origin_;
 
   std::string last_deleted_db_;
 
  private:
-  virtual ~MockBrowsingDataDatabaseHelper();
+  ~MockBrowsingDataDatabaseHelper() override;
 
   base::Callback<void(const std::list<DatabaseInfo>&)> callback_;
 
   // Stores which databases exist.
   std::map<const std::string, bool> databases_;
 
   std::list<DatabaseInfo> response_;
 
   DISALLOW_COPY_AND_ASSIGN(MockBrowsingDataDatabaseHelper);
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_MOCK_BROWSING_DATA_DATABASE_HELPER_H_