Add FilePath to base namespace.

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;
-class GURL;
+}
 
 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 FilePath& file,
+CONTENT_EXPORT void AddOriginMetadataToFile(const base::FilePath& file,
                                             const GURL& source,
                                             const GURL& referrer);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_FILE_METADATA_LINUX_H_