Move WriteFile and WriteFileDescriptor from file_util to 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_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 112 matching lines @@
     UserManager::Get()->UserLoggedIn(username, username_hash, false);
     WaitAsyncWallpaperLoadStarted();
   }
 
   // Saves bitmap |resource_id| to disk.
   void SaveUserWallpaperData(const base::FilePath& wallpaper_path,
                              int resource_id) {
     scoped_refptr<base::RefCountedStaticMemory> image_data(
         ResourceBundle::GetSharedInstance().LoadDataResourceBytesForScale(
             resource_id, ui::SCALE_FACTOR_100P));
-    int written = file_util::WriteFile(
+    int written = base::WriteFile(
         wallpaper_path,
         reinterpret_cast<const char*>(image_data->front()),
         image_data->size());
     EXPECT_EQ(static_cast<int>(image_data->size()), written);
   }
 
   int LoadedWallpapers() {
     return WallpaperManager::Get()->loaded_wallpapers();
   }
 
@@ skipping 402 matching lines @@
   EXPECT_TRUE(test_api->GetWallpaperFromCache(kTestUser1, &cached_wallpaper));
   EXPECT_TRUE(cached_wallpaper.BackedBySameObjectAs(green_wallpaper));
 
   wallpaper_manager->SetDefaultWallpaperNow(kTestUser1);
   WaitAsyncWallpaperLoadFinished();
   // SetDefaultWallpaper should invalidate the user's wallpaper cache.
   EXPECT_FALSE(test_api->GetWallpaperFromCache(kTestUser1, &cached_wallpaper));
 }
 
 }  // namespace chromeos