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

content/browser/download/download_file.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_DOWNLOAD_FILE_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_FILE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 60 matching lines @@
   virtual bool GetHash(std::string* hash) = 0;
 
   // Returns the current (intermediate) state of the hash as a byte string.
   virtual std::string GetHashState() = 0;
 
   // Set the application GUID to be used to identify the app to the
   // system AV function when scanning downloaded files. Should be called
   // before RenameAndAnnotate() to take effect.
   virtual void SetClientGuid(const std::string& guid) = 0;
 
+  // Set the download file's extension's visibility in the Finder (Mac).
+  virtual void SetHideFileExtension(bool hide_extension) = 0;
+
   // For testing.  Must be called on FILE thread.
   // TODO(rdsmith): Replace use of EnsureNoPendingDownloads()
   // on the DownloadManager with a test-specific DownloadFileFactory
   // which keeps track of the number of DownloadFiles.
   static int GetNumberOfDownloadFiles();
 
  protected:
   static int number_active_objects_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_FILE_H_