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Previously the listener only listened on changes to
kPasswordHashDataList. This is only good if the account
that has changed has already been given us. For all
content area account password changes, the username is
needed in order to find the appropriate account to report
the password change event to enterprise.

Bug: 914410
Change-Id: Iadf2753ddfc17570dbeb85a4936b72f12a166980
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1719975
Commit-Queue: Bettina Dea <bdea@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684172}