Added the following cvc regexes to make the heuristics work on sites of the top 100.

components/autofill/core/browser/autofill_regex_constants.cc

Index: components/autofill/core/browser/autofill_regex_constants.cc
diff --git a/components/autofill/core/browser/autofill_regex_constants.cc b/components/autofill/core/browser/autofill_regex_constants.cc
index db5456f0393735687f2258cbbade0b0ffff60ad6..d06b665cf404402e14339c47c5f41be24d9e9b02 100644
--- a/components/autofill/core/browser/autofill_regex_constants.cc
+++ b/components/autofill/core/browser/autofill_regex_constants.cc
@@ -148,6 +148,7 @@ const char kCardNumberRe[] =
     "|카드";  // ko-KR
 const char kCardCvcRe[] =
     "verification|card.?identification|security.?code|card.?code"
+    "|security.?number|card.?pin|c-v-v"
     "|(cvn|cvv|cvc|csc|cvd|cid|ccv)(field)?"
     "|\\bcid\\b";