Update {virtual,override} to follow C++11 style in net.

net/cookies/cookie_monster.cc

 // 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.
 
 // Portions of this code based on Mozilla:
 //   (netwerk/cookie/src/nsCookieService.cpp)
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
@@ skipping 539 matching lines @@
 
 // Base task class for Delete*Task.
 template <typename Result>
 class CookieMonster::DeleteTask : public CookieMonsterTask {
  public:
   DeleteTask(CookieMonster* cookie_monster,
              const typename CallbackType<Result>::Type& callback)
       : CookieMonsterTask(cookie_monster), callback_(callback) {}
 
   // CookieMonsterTask:
-  virtual void Run() override;
+  void Run() override;
 
  protected:
   ~DeleteTask() override;
 
  private:
   // Runs the delete task and returns a result.
   virtual Result RunDeleteTask() = 0;
   base::Closure RunDeleteTaskAndBindCallback();
   void FlushDone(const base::Closure& callback);
 
@@ skipping 1841 matching lines @@
        it != hook_map_.end(); ++it) {
     std::pair<GURL, std::string> key = it->first;
     if (cookie.IncludeForRequestURL(key.first, opts) &&
         cookie.Name() == key.second) {
       it->second->Notify(cookie, removed);
     }
   }
 }
 
 }  // namespace net