Add CookieStore::DeleteSessionCookiesAsync method.

net/cookies/cookie_store.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 number 42.
 
 #ifndef NET_COOKIES_COOKIE_STORE_H_
 #define NET_COOKIES_COOKIE_STORE_H_
 #pragma once
 
@@ skipping 81 matching lines @@
                                  const std::string& cookie_name,
                                  const base::Closure& callback) = 0;
 
   // Deletes all of the cookies that have a creation_date greater than or equal
   // to |delete_begin| and less than |delete_end|
   // Returns the number of cookies that have been deleted.
   virtual void DeleteAllCreatedBetweenAsync(const base::Time& delete_begin,
                                             const base::Time& delete_end,
                                             const DeleteCallback& callback) = 0;
 
+  virtual void DeleteSessionCookiesAsync(const DeleteCallback&) = 0;
+
   // Returns the underlying CookieMonster.
   virtual CookieMonster* GetCookieMonster() = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<CookieStore>;
   CookieStore();
   virtual ~CookieStore();
 };
 
 }  // namespace net
 
 #endif  // NET_COOKIES_COOKIE_STORE_H_