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This CL updates PasswordManagerProxy and adds basic properties to the
PasswordCheckBehavior to provide the ability to use passwords check for
weakness in the frontend. It also updates password_check a bit to
verify that basic logic works.

Bug: 1119752
Change-Id: I95133f63094fafa7ac105ebba3c1df357cb7bf1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421372Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Irina Fedorova <irfedorova@google.com>
Cr-Commit-Position: refs/heads/master@{#809731}