Remove wstring file path helpers from test_file_util.

base/test/test_file_util_win.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 "base/test/test_file_util.h"
 
 #include <windows.h>
 #include <aclapi.h>
 #include <shlwapi.h>
 
@@ skipping 249 matching lines @@
 }
 
 }  // namespace base
 
 namespace file_util {
 
 using base::DenyFilePermission;
 using base::GetPermissionInfo;
 using base::RestorePermissionInfo;
 
-std::wstring FilePathAsWString(const base::FilePath& path) {
-  return path.value();
-}
-base::FilePath WStringAsFilePath(const std::wstring& path) {
-  return base::FilePath(path);
-}
-
 bool MakeFileUnreadable(const base::FilePath& path) {
   return DenyFilePermission(path, GENERIC_READ);
 }
 
 bool MakeFileUnwritable(const base::FilePath& path) {
   return DenyFilePermission(path, GENERIC_WRITE);
 }
 
 PermissionRestorer::PermissionRestorer(const base::FilePath& path)
     : path_(path), info_(NULL), length_(0) {
   info_ = GetPermissionInfo(path_, &length_);
   DCHECK(info_ != NULL);
   DCHECK_NE(0u, length_);
 }
 
 PermissionRestorer::~PermissionRestorer() {
   if (!RestorePermissionInfo(path_, info_, length_))
     NOTREACHED();
 }
 
 }  // namespace file_util