Simple client side heuristics for checking username.
Do not use text field on change password forms if it contains only small number. It's unlikely that this is username, probably it's some service information which JavaScript uses for some purpose. This will fix change password support on facebook.com.
Also this CL contains a small fix with UI bubble, namely do not to show "no username" in Save Bubble. It was already implemented for change password forms, and currently it expands this for any "no username" credentials.
BUG=530082
Review URL: https://codereview.chromium.org/
1331043002
Cr-Commit-Position: refs/heads/master@{#348388}