Clean up cookie eviction.

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 521 matching lines @@
   // If the number of cookies for CookieMap key |key|, or globally, are
   // over the preset maximums above, garbage collect, first for the host and
   // then globally.  See comments above garbage collection threshold
   // constants for details.
   //
   // Returns the number of cookies deleted (useful for debugging).
   size_t GarbageCollect(const base::Time& current,
                         const std::string& key,
                         bool enforce_strict_secure);
 
+  // Helper for GarbageCollect(). Deletes up to |purge_goal| cookies with a
+  // priority less than or equal to |priority| from |cookies|, while ensuring
+  // that at least the |to_protect| most-recent cookies are retained.
+  //
+  // |cookies| must be sorted from least-recent to most-recent.
+  //
+  // |safe_date| is only used to determine the deletion cause for histograms.
+  //
+  // Returns the number of cookies deleted.
+  size_t PurgeLeastRecentMatches(CookieItVector* cookies,
+                                 CookiePriority priority,
+                                 size_t to_protect,
+                                 size_t purge_goal,
+                                 const base::Time& safe_date);
+
   // Helper for GarbageCollect(); can be called directly as well.  Deletes all
   // expired cookies in |itpair|.  If |cookie_its| is non-NULL, all the
   // non-expired cookies from |itpair| are appended to |cookie_its|.
   //
   // Returns the number of cookies deleted.
   size_t GarbageCollectExpired(const base::Time& current,
                                const CookieMapItPair& itpair,
                                CookieItVector* cookie_its);
 
   // Helper for GarbageCollect(). Deletes all cookies not marked Secure in
@@ skipping 229 matching lines @@
   virtual ~PersistentCookieStore() {}
 
  private:
   friend class base::RefCountedThreadSafe<PersistentCookieStore>;
   DISALLOW_COPY_AND_ASSIGN(PersistentCookieStore);
 };
 
 }  // namespace net
 
 #endif  // NET_COOKIES_COOKIE_MONSTER_H_