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

content/public/browser/download_manager_delegate.h

Index: content/public/browser/download_manager_delegate.h
diff --git a/content/public/browser/download_manager_delegate.h b/content/public/browser/download_manager_delegate.h
index 89be2df185542e3d854c27e556b229e363683197..c8cd85afa95e28e167a5757a87abaccf2946ced5 100644
--- a/content/public/browser/download_manager_delegate.h
+++ b/content/public/browser/download_manager_delegate.h
@@ -43,7 +43,8 @@ typedef base::Callback<void(
     const base::FilePath& target_path,
     DownloadItem::TargetDisposition disposition,
     DownloadDangerType danger_type,
-    const base::FilePath& intermediate_path)> DownloadTargetCallback;
+    const base::FilePath& intermediate_path,
+    bool hide_file_extension)> DownloadTargetCallback;
 
 // Called when a download delayed by the delegate has completed.
 typedef base::Callback<void(bool)> DownloadOpenDelayedCallback;