Standardize usage of virtual/override/final specifiers.

net/cookies/cookie_monster.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.
 
 // Brought to you by the letter D and the number 2.
 
 #ifndef NET_COOKIES_COOKIE_MONSTER_H_
 #define NET_COOKIES_COOKIE_MONSTER_H_
 
 #include <deque>
@@ skipping 297 matching lines @@
   // Both |other| and |this| must be loaded for this operation to succeed.
   // Furthermore, there may not be any cookies stored in |other| for |key|.
   // Returns false if any of these conditions is not met.
   bool CopyCookiesForKeyToOtherCookieMonster(std::string key,
                                              CookieMonster* other);
 
   // Find the key (for lookup in cookies_) based on the given domain.
   // See comment on keys before the CookieMap typedef.
   std::string GetKey(const std::string& domain) const;
 
-  virtual scoped_ptr<CookieChangedSubscription> AddCallbackForCookie(
+  scoped_ptr<CookieChangedSubscription> AddCallbackForCookie(
       const GURL& url,
       const std::string& name,
       const CookieChangedCallback& callback) override;
 
   bool loaded();
 
  private:
   // For queueing the cookie monster calls.
   class CookieMonsterTask;
   template <typename Result> class DeleteTask;
@@ skipping 457 matching lines @@
   virtual ~PersistentCookieStore() {}
 
  private:
   friend class base::RefCountedThreadSafe<PersistentCookieStore>;
   DISALLOW_COPY_AND_ASSIGN(PersistentCookieStore);
 };
 
 }  // namespace net
 
 #endif  // NET_COOKIES_COOKIE_MONSTER_H_