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Imagine the following:
(1) A user types a username, which matches saved credentials, so the password is autofilled.
(2) The user overwrites the suggested password in the password field.
(3) The user enters the username field again, but leaves it without changes.

Currently, the autofilled password after step 3 replaces the user-typed password from step 2.

This CL makes sure, that the password from step 2 stays.

BUG=385619

Review URL: https://codereview.chromium.org/414013003

Cr-Commit-Position: refs/heads/master@{#291938}