Revert 46757 - Fix IO thread hang on releasing a socket....

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 390 matching lines @@
 
   // The total number of idle sockets in the system.
   int idle_socket_count_;
 
   // Number of connecting sockets across all groups.
   int connecting_socket_count_;
 
   // Number of connected sockets we handed out across all groups.
   int handed_out_socket_count_;
 
-  // Number of sockets being released.
-  int num_releasing_sockets_;
-
   // The maximum total number of sockets. See ReachedMaxSocketsLimit.
   const int max_sockets_;
 
   // The maximum number of sockets kept per group.
   const int max_sockets_per_group_;
 
   // The time to wait until closing idle sockets.
   const base::TimeDelta unused_idle_socket_timeout_;
   const base::TimeDelta used_idle_socket_timeout_;
 
@@ skipping 199 matching lines @@
   // the posting of the task and the execution, then we'll hit the DCHECK that
   // |ClientSocketPoolBaseHelper::group_map_| is empty.
   scoped_refptr<internal::ClientSocketPoolBaseHelper> helper_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientSocketPoolBase);
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_CLIENT_SOCKET_POOL_BASE_H_