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

chrome/browser/download/download_file_picker.h

Index: chrome/browser/download/download_file_picker.h
diff --git a/chrome/browser/download/download_file_picker.h b/chrome/browser/download/download_file_picker.h
index bf7754dac3c63cff2508eb4a1104e6377f731706..8648504c8850fe6686414908c468cb44cb625158 100644
--- a/chrome/browser/download/download_file_picker.h
+++ b/chrome/browser/download/download_file_picker.h
@@ -27,8 +27,8 @@ class DownloadFilePicker : public ui::SelectFileDialog::Listener {
   //    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
@@ -45,12 +45,16 @@ class DownloadFilePicker : public ui::SelectFileDialog::Listener {
 
   // 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.