Http Bad: Add "Learn more" sublabel to warning message and make it clickable

components/autofill/core/browser/autofill_manager.cc

Index: components/autofill/core/browser/autofill_manager.cc
diff --git a/components/autofill/core/browser/autofill_manager.cc b/components/autofill/core/browser/autofill_manager.cc
index d7e7cfcf3e2bb6bb3f98cf20f8441a302e74f6fc..7f1e87df225052bdefb8634cb8312ea8128c883b 100644
--- a/components/autofill/core/browser/autofill_manager.cc
+++ b/components/autofill/core/browser/autofill_manager.cc
@@ -576,10 +576,11 @@ void AutofillManager::OnQueryFormFieldAutofill(int query_id,
         // On top of the explanation message, first show a "Payment not secure"
         // message.
         if (IsCreditCardAutofillHttpWarningEnabled()) {
-          Suggestion cc_field_http_warning_suggestion(l10n_util::GetStringUTF16(
-              IDS_AUTOFILL_CREDIT_CARD_HTTP_WARNING_MESSAGE));
-          cc_field_http_warning_suggestion.frontend_id =
-              POPUP_ITEM_ID_HTTP_NOT_SECURE_WARNING_MESSAGE;
+          Suggestion cc_field_http_warning_suggestion(
+              l10n_util::GetStringUTF8(
+                  IDS_AUTOFILL_CREDIT_CARD_HTTP_WARNING_MESSAGE),
+              l10n_util::GetStringUTF8(IDS_AUTOFILL_HTTP_WARNING_LEARN_MORE),
+              "", POPUP_ITEM_ID_HTTP_NOT_SECURE_WARNING_MESSAGE);
           suggestions.insert(suggestions.begin(),
                              cc_field_http_warning_suggestion);
         }
@@ -1071,6 +1072,10 @@ bool AutofillManager::ShouldUploadForm(const FormStructure& form) {
                kRequiredFieldsForFormsWithOnlyPasswordFields));
 }
 
+void AutofillManager::OpenUrl(const GURL& url) {
+  client_->OpenUrl(url);
+}
+
 void AutofillManager::ImportFormData(const FormStructure& submitted_form) {
   std::unique_ptr<CreditCard> imported_credit_card;
   if (!personal_data_->ImportFormData(