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Per the specs at go/fns-ui-spec, the "Login not secure" warning should
show up in username fields as well as password fields. Which makes sense
because usernames are sensitive information too. Thus, this CL populates
the "Login not secure" warning in the suggestions dropdown of a password
form regardless of whether the field is a password field or not.

BUG=675696
TEST=Enable #enable-http-form-warning in chrome://flags and relaunch
Chrome. Save a username/password in the Name/Password form in
http://rsolomakhin.github.io/autofill/. Focus the "Name" field and
observe a "Login not secure" warning in the autofill dropdown.

Review-Url: https://codereview.chromium.org/2585173006
Cr-Commit-Position: refs/heads/master@{#439837}