Refactor tcp socket and unix domain socket.

net/socket/tcp_socket.cc

 // Copyright 2013 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.
 
 #include "net/socket/tcp_socket.h"
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
+#include "base/location.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/worker_pool.h"
 
 namespace net {
 
 namespace {
 
 bool g_tcp_fastopen_enabled = false;
 
 #if defined(OS_LINUX) || defined(OS_ANDROID)
@@ skipping 54 matching lines @@
   } else {
     g_tcp_fastopen_enabled = false;
   }
 }
 
 bool IsTCPFastOpenEnabled() {
   return g_tcp_fastopen_enabled;
 }
 
 }  // namespace net