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

chrome/browser/chromeos/login/wallpaper_manager_browsertest.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/browser/chromeos/login/wallpaper_manager.h"
 
 #include "ash/ash_resources/grit/ash_wallpaper_resources.h"
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "ash/desktop_background/desktop_background_controller_observer.h"
 #include "ash/display/display_manager.h"
@@ skipping 76 matching lines @@
     base::MessageLoop::current()->Quit();
   }
 
  protected:
   // Return custom wallpaper path. Create directory if not exist.
   base::FilePath GetCustomWallpaperPath(const char* sub_dir,
                                         const std::string& email,
                                         const std::string& id) {
     base::FilePath wallpaper_path =
         WallpaperManager::Get()->GetCustomWallpaperPath(sub_dir, email, id);
-    if (!file_util::DirectoryExists(wallpaper_path.DirName()))
+    if (!base::DirectoryExists(wallpaper_path.DirName()))
       file_util::CreateDirectory(wallpaper_path.DirName());
 
     return wallpaper_path;
   }
 
   // Logs in |username|.
   void LogIn(const std::string& username) {
     UserManager::Get()->UserLoggedIn(username, username, false);
   }
 
@@ skipping 292 matching lines @@
 
 IN_PROC_BROWSER_TEST_F(WallpaperManagerBrowserTestNoAnimation,
                        UsePreMigrationWallpaperInfo) {
   LogIn(kTestUser1);
   WaitAsyncWallpaperLoad();
   // This test should finish normally. If timeout, it is probably because chrome
   // can not handle pre migrated user profile (M21 profile or older).
 }
 
 }  // namespace chromeos