Move directory creation functions to base namespace.

chrome/browser/chromeos/extensions/file_manager/file_browser_handler_api_test.cc

Index: chrome/browser/chromeos/extensions/file_manager/file_browser_handler_api_test.cc
diff --git a/chrome/browser/chromeos/extensions/file_manager/file_browser_handler_api_test.cc b/chrome/browser/chromeos/extensions/file_manager/file_browser_handler_api_test.cc
index 5386cc77db9fca706efcc4053e2a255654614184..a8f757e20ee77d6147f607b12767eada49b0cf0d 100644
--- a/chrome/browser/chromeos/extensions/file_manager/file_browser_handler_api_test.cc
+++ b/chrome/browser/chromeos/extensions/file_manager/file_browser_handler_api_test.cc
@@ -164,7 +164,7 @@ class FileBrowserHandlerExtensionTest : public ExtensionApiTest {
     // directory with an unique name.
     ASSERT_TRUE(scoped_tmp_dir_.CreateUniqueTempDir());
     tmp_mount_point_ = scoped_tmp_dir_.path().Append("tmp");
-    file_util::CreateDirectory(tmp_mount_point_);
+    base::CreateDirectory(tmp_mount_point_);
 
     ExtensionApiTest::SetUp();
   }