Bug 1515970 - Don't access creditCards store in _updateSavedFieldName…

…s unless it is enabled r=MattN

Differential Revision: https://phabricator.services.mozilla.com/D15393

--HG--
extra : moz-landing-system : lando

browser/extensions/formautofill/FormAutofillParent.jsm

@@ -353,9 +353,15 @@ FormAutofillParent.prototype = {
   _updateSavedFieldNames() {
     log.debug("_updateSavedFieldNames");
 
-    Services.ppmm.initialProcessData.autofillSavedFieldNames =
-      new Set([...this.formAutofillStorage.addresses.getSavedFieldNames(),
-        ...this.formAutofillStorage.creditCards.getSavedFieldNames()]);
+    // Don't access the credit cards store unless it is enabled.
+    if (FormAutofill.isAutofillCreditCardsAvailable) {
+      Services.ppmm.initialProcessData.autofillSavedFieldNames =
+        new Set([...this.formAutofillStorage.addresses.getSavedFieldNames(),
+          ...this.formAutofillStorage.creditCards.getSavedFieldNames()]);
+    } else {
+      Services.ppmm.initialProcessData.autofillSavedFieldNames =
+        this.formAutofillStorage.addresses.getSavedFieldNames();
+    }
 
     Services.ppmm.broadcastAsyncMessage("FormAutofill:savedFieldNames",
                                         Services.ppmm.initialProcessData.autofillSavedFieldNames);