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The API has evolved a bit, dropping the 'password' and 'formData'
accessors in favor of a 'toFormData(FormDataOptions)' method which
is intended to be used in conjunction with 'fetch()' to submit
credentials to a server-side endpoint.

Defined at [1] and [2].

[1]: https://w3c.github.io/webappsec/specs/credentialmanagement/#interfaces-credential-types-passwordcredential
[2]: https://w3c.github.io/webappsec/specs/credentialmanagement/#generate-formdata

BUG=526995

Review URL: https://codereview.chromium.org/1317043003

git-svn-id: svn://svn.chromium.org/blink/trunk@201631 bbb929c8-8fbe-4397-9dbb-9b2b20218538