Chrome doesn't expose any API to manipulate this window once it appears. You can only find a method of preventing it altogether. Depending on workflow it may be changing some attributes of the link or performing GM_xmlhttpRequest instead of the normal link navigation.
Is there any script to auto close google chrome save window
Hi
I want a script to auto close save window when it popup
In Google Chrome when you download file or save a file Google Chrome will ask you where to save the file
Only if you have "Ask where to save each file before" checked in Google Chrome setting