Enable "Hide Extension" option when "Save Link As" on the Mac

content/browser/download/file_metadata_mac.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_MAC_H_
 #define CONTENT_BROWSER_DOWNLOAD_FILE_METADATA_MAC_H_
 
+#include "content/common/content_export.h"
+
 class GURL;
 
 namespace base {
 class FilePath;
 }
 
 namespace content {
 
 // 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.
 void AddOriginMetadataToFile(const base::FilePath& file, const GURL& source,
                              const GURL& referrer);
 
 // Adds quarantine metadata to the file, assuming it has already been
 // quarantined by the OS.
 // |source| should be the source URL for the download, and |referrer| should be
 // the URL the user initiated the download from.
 void AddQuarantineMetadataToFile(const base::FilePath& file, const GURL& source,
                                  const GURL& referrer);
 
+// Sets or clears the NSFileExtensionHidden property on |file|, which shows or
+// hides |file|'s file extension in the Finder.
+CONTENT_EXPORT void SetExtensionHiddenForFile(const base::FilePath& file,
+                                              bool hidden);
+
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_FILE_METADATA_MAC_H_