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Now Fill On Account Select on password field displays all credentials,
including the ones with empty usernames.
If the credential with non-empty username is chosen first, and the
empty username credential is chosen on password field afterwards, the
username is not refilled.

Bug: 926844
Change-Id: Iacd62b9c17680fbebbee8199be7c4e2b0b41c83c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1982550
Commit-Queue: Maria Kazinova <kazinova@google.com>
Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727568}