Move PathIsWritable, DirectoryExists, ContentsEqual, and TextContentsEqual to the base namespace.

chrome/browser/ui/libgtk2ui/select_file_dialog_impl.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.
 //
 // This file implements common select dialog functionality between GTK and KDE.
 
 #include "chrome/browser/ui/libgtk2ui/select_file_dialog_impl.h"
 
 #include "base/environment.h"
 #include "base/file_util.h"
@@ skipping 72 matching lines @@
   listener_ = NULL;
 }
 
 bool SelectFileDialogImpl::IsRunning(gfx::NativeWindow parent_window) const {
   return parents_.find(parent_window) != parents_.end();
 }
 
 bool SelectFileDialogImpl::CallDirectoryExistsOnUIThread(
     const base::FilePath& path) {
   base::ThreadRestrictions::ScopedAllowIO allow_io;
-  return file_util::DirectoryExists(path);
+  return base::DirectoryExists(path);
 }
 
 }  // namespace libgtk2ui