Hmm.. now what, go to the password manager and remove that exception, right? On Windows, yes; on Mac no. Go to the wrench icon, preferences; select the center tab, click "show saved passwords". This opens up the "Keychain Access" tool on Mac. And guess what, it does not have the exception list there.
Solution:
1. Close Chrome
2. Goto to ~/Library/Application Support/Google/Chrome/Default
3. sqlite3 Login\ Data "select origin_url, blacklisted_by_user from logins"
You'll see that for the site for which you clicked "never for this site", the blacklisted_by_user value is 1. Just reset those values to 0
4. sqlite3 Login\ Data "update logins set blacklisted_by_user=1 where origin_url like '%google%'"
Now start your chrome, and save your passwords again.