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

ui/shell_dialogs/gtk/select_file_dialog_impl.h

 // Copyright (c) 2013 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.
 
 #ifndef UI_SHELL_DIALOGS_GTK_SELECT_FILE_DIALOG_IMPL_H_
 #define UI_SHELL_DIALOGS_GTK_SELECT_FILE_DIALOG_IMPL_H_
 
 #include <set>
@@ skipping 35 matching lines @@
   virtual void SelectFileImpl(
       Type type,
       const base::string16& title,
       const base::FilePath& default_path,
       const FileTypeInfo* file_types,
       int file_type_index,
       const base::FilePath::StringType& default_extension,
       gfx::NativeWindow owning_window,
       void* params) = 0;
 
-  // Wrapper for file_util::DirectoryExists() that allow access on the UI
+  // Wrapper for base::DirectoryExists() that allow access on the UI
   // thread. Use this only in the file dialog functions, where it's ok
   // because the file dialog has to do many stats anyway. One more won't
   // hurt too badly and it's likely already cached.
   bool CallDirectoryExistsOnUIThread(const base::FilePath& path);
 
   // The file filters.
   FileTypeInfo file_types_;
 
   // The index of the default selected file filter.
   // Note: This starts from 1, not 0.
@@ skipping 13 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(SelectFileDialogImpl);
 };
 
 SelectFileDialog* CreateLinuxSelectFileDialog(
     SelectFileDialog::Listener* listener,
     SelectFilePolicy* policy);
 
 }  // namespace ui
 
 #endif  // UI_SHELL_DIALOGS_GTK_SELECT_FILE_DIALOG_IMPL_H_