Move ReadFileToString to the base namespace.

net/socket/tcp_client_socket.cc

 // Copyright (c) 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_client_socket.h"
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 
 namespace net {
 
 namespace {
 
 #if defined(OS_LINUX)
 
 // Checks to see if the system supports TCP FastOpen. Notably, it requires
 // kernel support. Additionally, this checks system configuration to ensure that
 // it's enabled.
 bool SystemSupportsTCPFastOpen() {
   static const base::FilePath::CharType kTCPFastOpenProcFilePath[] =
       "/proc/sys/net/ipv4/tcp_fastopen";
   std::string system_enabled_tcp_fastopen;
-  if (!file_util::ReadFileToString(
+  if (!base::ReadFileToString(
           base::FilePath(kTCPFastOpenProcFilePath),
           &system_enabled_tcp_fastopen)) {
     return false;
   }
 
   // As per http://lxr.linux.no/linux+v3.7.7/include/net/tcp.h#L225
   // TFO_CLIENT_ENABLE is the LSB
   if (system_enabled_tcp_fastopen.empty() ||
       (system_enabled_tcp_fastopen[0] & 0x1) == 0) {
     return false;
@@ skipping 16 matching lines @@
 
 void SetTCPFastOpenEnabled(bool value) {
   g_tcp_fastopen_enabled = value && SystemSupportsTCPFastOpen();
 }
 
 bool IsTCPFastOpenEnabled() {
   return g_tcp_fastopen_enabled;
 }
 
 }  // namespace net