Make form-not-secure controllable as its own separate Finch feature

components/autofill/core/browser/autofill_experiments.h

Index: components/autofill/core/browser/autofill_experiments.h
diff --git a/components/autofill/core/browser/autofill_experiments.h b/components/autofill/core/browser/autofill_experiments.h
index fc02866e1643ee97a3dd33d958cb89e534728bf2..02e891b907c801cf4ac269f7f709feb1524750fc 100644
--- a/components/autofill/core/browser/autofill_experiments.h
+++ b/components/autofill/core/browser/autofill_experiments.h
@@ -67,10 +67,6 @@ bool IsCreditCardUploadEnabled(const PrefService* pref_service,
                                const syncer::SyncService* sync_service,
                                const std::string& user_email);
 
-// Returns true if the http warning switch is on, which will display a warning
-// in the autofill dropdown when credit card fields are on an HTTP page.
-bool IsCreditCardAutofillHttpWarningEnabled();
-
 // Returns whether the new Autofill credit card popup layout experiment is
 // enabled.
 bool IsAutofillCreditCardPopupLayoutExperimentEnabled();