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This change adds an UI flag for the Bulk Password Check feature on
Desktop.

Bug: 1049177
Change-Id: I5ffc4ab33ade02b1a3a9b5181770704e4d3e2af7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2043834Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739411}