Move PathExists to base namespace.

chrome/browser/importer/firefox_importer_utils_linux.cc

 // Copyright (c) 2009 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 "chrome/browser/importer/firefox_importer_utils.h"
 
 #include "base/file_util.h"
 
 base::FilePath GetProfilesINI() {
   base::FilePath ini_file;
   // The default location of the profile folder containing user data is
   // under user HOME directory in .mozilla/firefox folder on Linux.
   base::FilePath home = file_util::GetHomeDir();
   if (!home.empty()) {
     ini_file = home.Append(".mozilla/firefox/profiles.ini");
   }
-  if (file_util::PathExists(ini_file))
+  if (base::PathExists(ini_file))
     return ini_file;
 
   return base::FilePath();
 }