Simplify CookieMonster::SetAllCookies{,Async}() implementation.

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 <stddef.h>
@@ skipping 131 matching lines @@
                 CookieMonsterDelegate* delegate,
                 ChannelIDService* channel_id_service);
 
   // Only used during unit testing.
   CookieMonster(PersistentCookieStore* store,
                 CookieMonsterDelegate* delegate,
                 base::TimeDelta last_access_threshold);
 
   ~CookieMonster() override;
 
-  // Writes all the cookies in |list| into the store, replacing existing
-  // cookies that collide.  Does not affect cookies not listed in |list|.
+  // Writes all the cookies in |list| into the store, replacing all cookies
+  // currently present in store.
   // This method does not flush the backend.
   // TODO(rdsmith, mmenke): Do not use this function; it is deprecated
   // and should be removed.
   // See https://codereview.chromium.org/2882063002/#msg64.
   void SetAllCookiesAsync(const CookieList& list, SetCookiesCallback callback);
 
   // CookieStore implementation.
   void SetCookieWithOptionsAsync(const GURL& url,
                                  const std::string& cookie_line,
                                  const CookieOptions& options,
@@ skipping 644 matching lines @@
   virtual ~PersistentCookieStore() {}
 
  private:
   friend class base::RefCountedThreadSafe<PersistentCookieStore>;
   DISALLOW_COPY_AND_ASSIGN(PersistentCookieStore);
 };
 
 }  // namespace net
 
 #endif  // NET_COOKIES_COOKIE_MONSTER_H_