Fix crash in ClientSocketPoolBase.

net/socket/tcp_client_socket_pool.h

Index: net/socket/tcp_client_socket_pool.h
diff --git a/net/socket/tcp_client_socket_pool.h b/net/socket/tcp_client_socket_pool.h
index e237be5d816100715aa7bde7d909c1af0285cd2a..421ea9a113252792e478f6d984f26705d0105ef5 100644
--- a/net/socket/tcp_client_socket_pool.h
+++ b/net/socket/tcp_client_socket_pool.h
@@ -240,6 +240,9 @@ class ClientSocketPoolBase : public base::RefCounted<ClientSocketPoolBase> {
 
   static void CheckSocketCounts(const Group& group);
 
+  // Remove an active socket.
+  void RemoveActiveSocket(const std::string& group_name, Group* group);
+
   // Process a request from a group's pending_requests queue.
   void ProcessPendingRequest(const std::string& group_name, Group* group);