Move directory creation functions to base namespace.

chrome/browser/extensions/api/file_system/file_system_apitest.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 "apps/saved_files_service.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "build/build_config.h"
 #include "chrome/browser/apps/app_browsertest_util.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 160 matching lines @@
   ASSERT_TRUE(RunPlatformAppTest(
       "api_test/file_system/get_display_path_prettify")) << message_;
 }
 #endif
 
 #if defined(OS_MACOSX)
 IN_PROC_BROWSER_TEST_F(FileSystemApiTest,
     FileSystemApiGetDisplayPathPrettifyMac) {
   // On Mac, "test.localized" will be localized into just "test".
   base::FilePath test_path = TempFilePath("test.localized", false);
-  ASSERT_TRUE(file_util::CreateDirectory(test_path));
+  ASSERT_TRUE(base::CreateDirectory(test_path));
 
   base::FilePath test_file = test_path.AppendASCII("gold.txt");
   base::FilePath source = test_root_folder_.AppendASCII("gold.txt");
   EXPECT_TRUE(base::CopyFile(source, test_file));
 
   FileSystemChooseEntryFunction::SkipPickerAndAlwaysSelectPathForTest(
       &test_file);
   ASSERT_TRUE(RunPlatformAppTest(
       "api_test/file_system/get_display_path_prettify_mac")) << message_;
 }
@@ skipping 435 matching lines @@
   AppInstallObserver observer(
       base::Bind(AddSavedEntry,
                  test_directory,
                  true,
                  apps::SavedFilesService::Get(profile())));
   ASSERT_TRUE(RunPlatformAppTest("api_test/file_system/restore_directory"))
       << message_;
 }
 
 }  // namespace extensions