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Connects the previously introduced Password Leak Detection generated
preference to the toggle control present in the security page. This
also deprecates the passwords_leak_detection_toggle element and the
associated test.

Bug: 1063265
Change-Id: I0ddacd706696db6f60fdc2035537c60da594a685
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2330152
Commit-Queue: Theodore Olsauskas-Warren <sauski@google.com>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807873}