Clean up socket backup job when there are no requests.

net/socket/client_socket_pool_base.h

 // Copyright (c) 2010 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.
 //
 // A ClientSocketPoolBase is used to restrict the number of sockets open at
 // a time.  It also maintains a list of idle persistent sockets for reuse.
 // Subclasses of ClientSocketPool should compose ClientSocketPoolBase to handle
 // the core logic of (1) restricting the number of active (connected or
 // connecting) sockets per "group" (generally speaking, the hostname), (2)
 // maintaining a per-group list of idle, persistent sockets for reuse, and (3)
@@ skipping 338 matching lines @@
   };
 
   typedef std::map<const ClientSocketHandle*, CallbackResultPair>
       PendingCallbackMap;
 
   ~ClientSocketPoolBaseHelper();
 
   static void InsertRequestIntoQueue(const Request* r,
                                      RequestQueue* pending_requests);
   static const Request* RemoveRequestFromQueue(RequestQueue::iterator it,
-                                               RequestQueue* pending_requests);
+                                               Group* group);
 
   Group* GetOrCreateGroup(const std::string& group_name);
   void RemoveGroup(const std::string& group_name);
   void RemoveGroup(GroupMap::iterator it);
 
   // Called when the number of idle sockets changes.
   void IncrementIdleCount();
   void DecrementIdleCount();
 
   // Scans the group map for groups which have an available socket slot and
@@ skipping 291 matching lines @@
   // ClientSocketPoolBase<T> reference to drop to zero.  While we're deep
   // in cleanup code, we'll often hold a reference to |self|.
   scoped_refptr<internal::ClientSocketPoolBaseHelper> helper_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientSocketPoolBase);
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_CLIENT_SOCKET_POOL_BASE_H_