[Plugin: Google Identity Toolkit] How To Remove Header Button

This is terrific work and is just what I’ve been searching for. Thank you so much.
My problem is that the button in my header and ruins my theme. Can you explain how to remove the header button but leave the changes to the wp-login.php? I’ve tried commenting out various pieces of javascript to mixed results, I think I just don’t understand plugin architecture enough to know what to change precisely.

http://wordpress.org/extend/plugins/google-identity-toolkit/