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This will allow users to opt out of leak check if desired.
Also added a missing test for passwordAutofillEnabled.

Bug: 1096281
Change-Id: Ibff3bf6fdb7b6bac6170f6b9aaa44938076f49fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401943Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Commit-Queue: John Wu <jzw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805820}