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Refactoring PasswordAutofillAgent::FillUserNameAndPassword for early return if password_element is not autocompleteable.

PasswordAutofillAgent::FillUserNameAndPassword function refactor done for early return as we chould check this at start only.

BUG=398436

Review URL: https://codereview.chromium.org/557703002

Cr-Commit-Position: refs/heads/master@{#295653}