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[Passwords] Use Async Await in the Password Check tests

Similarly to https://crrev.com/c/2107984 this change migrates all tests
in password_check_test.js to async / wait, rather than returning promises.
This change does not modify functionality.

Bug: 1047726
Change-Id: Ic2de2a713a0af6ad9f6ec9450b4a0ec2849ca402
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2120492
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753397}