Change some snapshot- or temporary-file related changes to use ScopedFile

webkit/fileapi/file_snapshot_policy.h

-// Copyright (c) 2013 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 WEBKIT_FILEAPI_FILE_SNAPSHOT_POLICY_H_
-#define WEBKIT_FILEAPI_FILE_SNAPSHOT_POLICY_H_
-
-namespace fileapi {
-
-// A policy flag for CreateSnapshotFile.
-enum SnapshotFilePolicy {
-  kSnapshotFileUnknown,
-
-  // The implementation just uses the local file as the snapshot file.
-  // The FileAPI backend does nothing on the returned file.
-  kSnapshotFileLocal,
-
-  // The implementation returns a temporary file as the snapshot file.
-  // The FileAPI backend takes care of the lifetime of the returned file
-  // and will delete when the last reference of the file is dropped.
-  kSnapshotFileTemporary,
-};
-
-}  // namespace fileapi
-
-#endif  // WEBKIT_FILEAPI_FILE_SNAPSHOT_POLICY_H_