Revert of mandoline filesystem: Save cookie data to the mojo:filesystem.

mojo/runner/scoped_user_data_dir.h

-// Copyright 2015 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.
-
-#ifndef MOJO_RUNNER_SCOPED_USER_DATA_DIR_H_
-#define MOJO_RUNNER_SCOPED_USER_DATA_DIR_H_
-
-#include "base/files/scoped_temp_dir.h"
-
-namespace mojo {
-namespace runner {
-
-// A scoped class which owns a ScopedTempDir if --use-temporary-user-data-dir
-// is set. If it is, also modifies the command line so that --user-data-dir
-// points to the temporary dir.
-class ScopedUserDataDir {
- public:
-  ScopedUserDataDir();
-  ~ScopedUserDataDir();
-
- private:
-  base::ScopedTempDir temp_dir_;
-};
-
-}  // namespace runner
-}  // namespace mojo
-
-#endif  // MOJO_RUNNER_SCOPED_USER_DATA_DIR_H_