Move directory creation functions to base namespace.

chrome/browser/chromeos/login/wallpaper_manager.cc

Index: chrome/browser/chromeos/login/wallpaper_manager.cc
diff --git a/chrome/browser/chromeos/login/wallpaper_manager.cc b/chrome/browser/chromeos/login/wallpaper_manager.cc
index f838f6fb80975164aa32e1bf707a338bffd6c716..6043f1356b07ec3f79b04692595e4556eabccaaa 100644
--- a/chrome/browser/chromeos/login/wallpaper_manager.cc
+++ b/chrome/browser/chromeos/login/wallpaper_manager.cc
@@ -741,19 +741,19 @@ void WallpaperManager::EnsureCustomWallpaperDirectories(
   dir = GetCustomWallpaperDir(kSmallWallpaperSubDir);
   dir = dir.Append(user_id_hash);
   if (!base::PathExists(dir))
-    file_util::CreateDirectory(dir);
+    base::CreateDirectory(dir);
   dir = GetCustomWallpaperDir(kLargeWallpaperSubDir);
   dir = dir.Append(user_id_hash);
   if (!base::PathExists(dir))
-    file_util::CreateDirectory(dir);
+    base::CreateDirectory(dir);
   dir = GetCustomWallpaperDir(kOriginalWallpaperSubDir);
   dir = dir.Append(user_id_hash);
   if (!base::PathExists(dir))
-    file_util::CreateDirectory(dir);
+    base::CreateDirectory(dir);
   dir = GetCustomWallpaperDir(kThumbnailWallpaperSubDir);
   dir = dir.Append(user_id_hash);
   if (!base::PathExists(dir))
-    file_util::CreateDirectory(dir);
+    base::CreateDirectory(dir);
 }
 
 CommandLine* WallpaperManager::GetComandLine() {