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

chrome/browser/download/download_file_picker.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 CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_PICKER_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_PICKER_H_
 
 #include "base/callback.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace content {
 class DownloadItem;
 class DownloadManager;
 class WebContents;
 }
 
 // Handles showing a dialog to the user to ask for the filename for a download.
 class DownloadFilePicker : public ui::SelectFileDialog::Listener {
  public:
   // Callback used to pass the user selection back to the owner of this
   // object.
   // |virtual_path|: The path chosen by the user. If the user cancels the file
   //    selection, then this parameter will be the empty path. On Chrome OS,
   //    this path may contain virtual mount points if the user chose a virtual
   //    path (e.g. Google Drive).
-  typedef base::Callback<void(const base::FilePath& virtual_path)>
-      FileSelectedCallback;
+  typedef base::Callback<void(const base::FilePath& virtual_path,
+      bool hide_file_extension)> FileSelectedCallback;
 
   // Display a file picker dialog for |item|. The |suggested_path| will be used
   // as the initial path displayed to the user. |callback| will always be
   // invoked even if |item| is destroyed prior to the file picker completing.
   static void ShowFilePicker(content::DownloadItem* item,
                              const base::FilePath& suggested_path,
                              const FileSelectedCallback& callback);
 
  private:
   DownloadFilePicker(content::DownloadItem* item,
                      const base::FilePath& suggested_path,
                      const FileSelectedCallback& callback);
   ~DownloadFilePicker() override;
 
   // Runs |file_selected_callback_| with |virtual_path| and then deletes this
   // object.
-  void OnFileSelected(const base::FilePath& virtual_path);
+  void OnFileSelected(const base::FilePath& virtual_path,
+                      bool hide_file_extension);
 
   // SelectFileDialog::Listener implementation.
   void FileSelected(const base::FilePath& path,
                     int index,
                     void* params) override;
+  void FileSelectedWithExtraInfo(const ui::SelectedFileInfo& file,
+                                 int index,
+                                 void* params) override;
   void FileSelectionCanceled(void* params) override;
 
   // Initially suggested path.
   base::FilePath suggested_path_;
 
   // Callback invoked when a file selection is complete.
   FileSelectedCallback file_selected_callback_;
 
   // For managing select file dialogs.
   scoped_refptr<ui::SelectFileDialog> select_file_dialog_;
 
   // True if UMA regarding on the result of the file selection should be
   // recorded.
   bool should_record_file_picker_result_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadFilePicker);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_PICKER_H_