Remove mediator from the spec

spec/frontend/sidebar/lock/issuable_lock_form_spec.js

@@ -9,7 +9,6 @@ import { ISSUABLE_TYPE_ISSUE, ISSUABLE_TYPE_MR } from './constants';
 describe('IssuableLockForm', () => {
   let wrapper;
   let store;
-  let mediator;
   let issuableType; // Either ISSUABLE_TYPE_ISSUE or ISSUABLE_TYPE_MR
 
   const setIssuableType = pageType => {
@@ -21,15 +20,6 @@ describe('IssuableLockForm', () => {
   const findEditLink = () => wrapper.find('[data-testid="edit-link"]');
   const findEditForm = () => wrapper.find(EditForm);
 
-  const initMediator = () => {
-    mediator = {
-      service: {
-        update: Promise.resolve(true),
-      },
-      store: {},
-    };
-  };
-
   const initStore = isLocked => {
     if (issuableType === ISSUABLE_TYPE_ISSUE) {
       store = createStore();
@@ -45,7 +35,6 @@ describe('IssuableLockForm', () => {
       store,
       propsData: {
         isEditable: true,
-        mediator,
         ...props,
       },
     });
@@ -62,7 +51,6 @@ describe('IssuableLockForm', () => {
   `('In $pageType page', ({ pageType }) => {
     beforeEach(() => {
       setIssuableType(pageType);
-      initMediator();
     });
 
     describe.each`