Add a counter for clicking on Form-Not-Secure warnings

components/autofill/core/browser/autofill_external_delegate.cc

Index: components/autofill/core/browser/autofill_external_delegate.cc
diff --git a/components/autofill/core/browser/autofill_external_delegate.cc b/components/autofill/core/browser/autofill_external_delegate.cc
index bfab143d75ef849555fab068b191dd4b1565dc39..ff384865dd81395c670df829f83d5ed9559cdffd 100644
--- a/components/autofill/core/browser/autofill_external_delegate.cc
+++ b/components/autofill/core/browser/autofill_external_delegate.cc
@@ -230,6 +230,7 @@ void AutofillExternalDelegate::DidAcceptSuggestion(const base::string16& value,
   } else if (identifier == POPUP_ITEM_ID_CREDIT_CARD_SIGNIN_PROMO) {
     manager_->client()->StartSigninFlow();
   } else if (identifier == POPUP_ITEM_ID_HTTP_NOT_SECURE_WARNING_MESSAGE) {
+    AutofillMetrics::LogShowedHttpNotSecureExplanation();
     manager_->client()->ShowHttpNotSecureExplanation();
   } else {
     if (identifier > 0)  // Denotes an Autofill suggestion.