Because of false positives like issue 663380 , we might want to split out the "Not secure" omnibox warning UMA by whether a password or credit card (or both) triggered it.
We only expect to see credit card forms on http very very rarely, so if the credit card detection rate is high, that might be an indication of false positives.
Comment 1 by est...@chromium.org
, Nov 9 2016