You can't override this, but you can implement your own info window handling and replace the attribute. Here's a snippet of code demonstrating the solution:
http://people.missouristate.edu/chadkillingsworth/mapsexamples/removekmllinktargets.js -- You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-maps-js-api-v3/-/_kb_6Zp2YywJ. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-maps-js-api-v3?hl=en.
