Different solution, webkit based. As mentioned already, anytime Chrome finds a password field it autocompletes the email. AFAIK, this is regardless of autocomplete = [whatever].
To circumvent this change the input type to text and apply the webkit security font in whatever form you want.
.secure-font{
-webkit-text-security:disc;}
From what I can see this is at least as secure as input type=password, it's copy and paste secure. However it is vulnerable by removing the style which will remove asterisks, of course input type = password can easily be changed to input type = text in the console to reveal any autofilled passwords so it's much the same really.
