Move directory creation functions to base namespace.

chrome/browser/chromeos/imageburner/burn_manager.cc

Index: chrome/browser/chromeos/imageburner/burn_manager.cc
diff --git a/chrome/browser/chromeos/imageburner/burn_manager.cc b/chrome/browser/chromeos/imageburner/burn_manager.cc
index de6f7f6fbb412259a076a1f2232077c47b16a9bb..0a5e84b78ce7f3eee4f32b60e3f64694621aad5b 100644
--- a/chrome/browser/chromeos/imageburner/burn_manager.cc
+++ b/chrome/browser/chromeos/imageburner/burn_manager.cc
@@ -40,7 +40,7 @@ BurnManager* g_burn_manager = NULL;
 // Cretes a directory and calls |callback| with the result on UI thread.
 void CreateDirectory(const base::FilePath& path,
                      base::Callback<void(bool success)> callback) {
-  const bool success = file_util::CreateDirectory(path);
+  const bool success = base::CreateDirectory(path);
   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
                           base::Bind(callback, success));
 }