Fix Closure transpile.js build error

See also:
- google/closure-compiler#2051
- bazelbuild/rules_closure@9e92334

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=135138725

javatests/google/registry/ui/js/registrar/contact_settings_test.js

@@ -286,6 +286,7 @@ function testDelete() {
 
 /**
  * @param {string=} opt_email
+ * @return {Object}
  */
 function createTestContact(opt_email) {
   var nameMail = opt_email || 'test@example.com';
@@ -304,6 +305,7 @@ function createTestContact(opt_email) {
 /**
  * Convert parsed formContact to simulated wire form.
  * @param {!Element} contact
+ * @return {Object}
  */
 function simulateJsonForContact(contact) {
   contact.visibleInWhoisAsAdmin = contact.visibleInWhoisAsAdmin == 'true';

javatests/google/registry/ui/js/registrar/whois_settings_test.js

@@ -66,7 +66,10 @@ function tearDown() {
 }
 
 
-/** Creates a test registrar. */
+/**
+ * Creates test registrar.
+ * @return {Object}
+ */
 function createTestRegistrar() {
   return {
     emailAddress: 'test2.ui@example.com',