[Credential manager API test] Updates creation of local credentials.

Author: Tatiana Gornak

demos/credential-management-api-test/credential.html

@@ -98,11 +98,21 @@ <h1>AN AMAZING DEMO OF THE ASTOUNDING CREDENTIAL MANAGER API!</h1>
     function createCredentialFromForm(form) {
       try {
         if (form.elements['type'].value == "local") {
-          return new LocalCredential(
+          try {
+            return new PasswordCredential(
               form.elements['username'].value,
               form.elements['password'].value,
               form.elements['friendly'].value,
               form.elements['avatar'].value);
+          } catch (e) {
+            if (!(e instanceof ReferenceError))
+              throw e;
+            return new LocalCredential(
+              form.elements['username'].value,
+              form.elements['password'].value,
+              form.elements['friendly'].value,
+              form.elements['avatar'].value);
+          }
         } else {
           return new FederatedCredential(
               form.elements['username'].value,