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

chrome/browser/browsing_data/mock_browsing_data_cookie_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_COOKIE_HELPER_H_
 #define CHROME_BROWSER_BROWSING_DATA_MOCK_BROWSING_DATA_COOKIE_HELPER_H_
 
 #include <map>
 #include <string>
 
 #include "chrome/browser/browsing_data/browsing_data_cookie_helper.h"
 #include "net/cookies/canonical_cookie.h"
 
 // Mock for BrowsingDataCookieHelper.
 class MockBrowsingDataCookieHelper : public BrowsingDataCookieHelper {
  public:
   explicit MockBrowsingDataCookieHelper(
       net::URLRequestContextGetter* request_context_getter);
 
   // BrowsingDataCookieHelper methods.
-  virtual void StartFetching(
-      const net::CookieMonster::GetCookieListCallback &callback) override;
-  virtual void DeleteCookie(const net::CanonicalCookie& cookie) override;
+  void StartFetching(
+      const net::CookieMonster::GetCookieListCallback& callback) override;
+  void DeleteCookie(const net::CanonicalCookie& cookie) override;
 
   // Adds some cookie samples.
   void AddCookieSamples(const GURL& url, const std::string& cookie_line);
 
   // Notifies the callback.
   void Notify();
 
   // Marks all cookies as existing.
   void Reset();
 
   // Returns true if all cookies since the last Reset() invocation were
   // deleted.
   bool AllDeleted();
 
  private:
-  virtual ~MockBrowsingDataCookieHelper();
+  ~MockBrowsingDataCookieHelper() override;
 
   net::CookieMonster::GetCookieListCallback callback_;
 
   net::CookieList cookie_list_;
 
   // Stores which cookies exist.
   std::map<const std::string, bool> cookies_;
 
   DISALLOW_COPY_AND_ASSIGN(MockBrowsingDataCookieHelper);
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_MOCK_BROWSING_DATA_COOKIE_HELPER_H_