Use correct element for Form Not Secure warning

components/autofill/content/renderer/form_autofill_util.cc

Index: components/autofill/content/renderer/form_autofill_util.cc
diff --git a/components/autofill/content/renderer/form_autofill_util.cc b/components/autofill/content/renderer/form_autofill_util.cc
index f2056c1579d8025af98a76d462481943adcaca7b..8d690c2446a2a26163f46760c728104f15249f37 100644
--- a/components/autofill/content/renderer/form_autofill_util.cc
+++ b/components/autofill/content/renderer/form_autofill_util.cc
@@ -1619,6 +1619,8 @@ bool UnownedPasswordFormElementsAndFieldSetsToFormData(
 bool FindFormAndFieldForFormControlElement(const WebFormControlElement& element,
                                            FormData* form,
                                            FormFieldData* field) {
+  DCHECK(!element.isNull());
+
   if (!IsAutofillableElement(element))
     return false;