[Downloads] Consolidate MOTW annotation APIs into a single API.

content/browser/download/file_metadata_linux.h

-// 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.
-
-#ifndef CONTENT_BROWSER_DOWNLOAD_FILE_METADATA_LINUX_H_
-#define CONTENT_BROWSER_DOWNLOAD_FILE_METADATA_LINUX_H_
-
-#include "content/common/content_export.h"
-
-class GURL;
-
-namespace base {
-class FilePath;
-}
-
-namespace content {
-
-// The source URL attribute is part of the XDG standard.
-// The referrer URL attribute is not part of the XDG standard,
-// but it is used to keep the naming consistent.
-// http://freedesktop.org/wiki/CommonExtendedAttributes
-CONTENT_EXPORT extern const char kSourceURLAttrName[];
-CONTENT_EXPORT extern const char kReferrerURLAttrName[];
-
-// Adds origin metadata to the file.
-// |source| should be the source URL for the download, and |referrer| should be
-// the URL the user initiated the download from.
-CONTENT_EXPORT void AddOriginMetadataToFile(const base::FilePath& file,
-                                            const GURL& source,
-                                            const GURL& referrer);
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_DOWNLOAD_FILE_METADATA_LINUX_H_