Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/installer/setup/setup_main.cc

 // Copyright (c) 2012 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/installer/setup/setup_main.h"
 
 #include <windows.h>
 #include <msi.h>
 #include <shellapi.h>
 #include <shlobj.h>
@@ skipping 842 matching lines @@
 // Creates the sentinel indicating that the EULA was required and has been
 // accepted.
 bool CreateEULASentinel(BrowserDistribution* dist) {
   base::FilePath eula_sentinel;
   if (!InstallUtil::GetSentinelFilePath(installer::kEULASentinelFile, dist,
                                         &eula_sentinel)) {
     return false;
   }
 
   return (base::CreateDirectory(eula_sentinel.DirName()) &&
-          file_util::WriteFile(eula_sentinel, "", 0) != -1);
+          base::WriteFile(eula_sentinel, "", 0) != -1);
 }
 
 void ActivateMetroChrome() {
   // Check to see if we're per-user or not. Need to do this since we may
   // not have been invoked with --system-level even for a machine install.
   wchar_t exe_path[MAX_PATH * 2] = {};
   GetModuleFileName(NULL, exe_path, arraysize(exe_path));
   bool is_per_user_install = InstallUtil::IsPerUserInstall(exe_path);
 
   base::string16 app_model_id = ShellUtil::GetBrowserModelId(
@@ skipping 937 matching lines @@
     // Note that we allow the status installer::UNINSTALL_REQUIRES_REBOOT
     // to pass through, since this is only returned on uninstall which is
     // never invoked directly by Google Update.
     return_code = InstallUtil::GetInstallReturnCode(install_status);
   }
 
   VLOG(1) << "Installation complete, returning: " << return_code;
 
   return return_code;
 }