file_util: Convert the wstring version of IsDirectoryEmpty to FilePath.

base/file_util_win.cc

 // Copyright (c) 2010 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/file_util.h"
 
 #include <windows.h>
 #include <propvarutil.h>
 #include <shellapi.h>
 #include <shlobj.h>
@@ skipping 413 matching lines @@
 bool TaskbarUnpinShortcutLink(const wchar_t* shortcut) {
   // "Unpin from taskbar" is only supported after Win7.
   if (win_util::GetWinVersion() < win_util::WINVERSION_WIN7)
     return false;
 
   int result = reinterpret_cast<int>(ShellExecute(NULL, L"taskbarunpin",
       shortcut, NULL, NULL, 0));
   return result > 32;
 }
 
-bool IsDirectoryEmpty(const std::wstring& dir_path) {
-  FileEnumerator files(FilePath(dir_path), false,
-    static_cast<FileEnumerator::FILE_TYPE>(
-        FileEnumerator::FILES | FileEnumerator::DIRECTORIES));
-  if (files.Next().value().empty())
-    return true;
-  return false;
-}
-
 bool GetTempDir(FilePath* path) {
   wchar_t temp_path[MAX_PATH + 1];
   DWORD path_len = ::GetTempPath(MAX_PATH, temp_path);
   if (path_len >= MAX_PATH || path_len <= 0)
     return false;
   // TODO(evanm): the old behavior of this function was to always strip the
   // trailing slash.  We duplicate this here, but it shouldn't be necessary
   // when everyone is using the appropriate FilePath APIs.
   *path = FilePath(temp_path).StripTrailingSeparators();
   return true;
@@ skipping 446 matching lines @@
 }
 
 bool HasFileBeenModifiedSince(const FileEnumerator::FindInfo& find_info,
                               const base::Time& cutoff_time) {
   long result = CompareFileTime(&find_info.ftLastWriteTime,
                                 &cutoff_time.ToFileTime());
   return result == 1 || result == 0;
 }
 
 }  // namespace file_util