[ios Mojo] Implemented chrome://version.

components/version_ui/resources/about_version_ios.js

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-/**
- * Callback from the backend with the list of variations to display.
- * This call will build the variations section of the version page, or hide that
- * section if there are none to display.
- * @param {!Array<string>} variationsList The list of variations.
- */
-function returnVariationInfo(variationsList) {
-  $('variations-section').hidden = !variationsList.length;
-  $('variations-list').appendChild(
-      parseHtmlSubset(variationsList.join('<br>'), ['BR']));
-}
-
-
-/* All the work we do onload. */
-function onLoadWork() {
-  chrome.send('requestVersionInfo');
-}
-
-document.addEventListener('DOMContentLoaded', onLoadWork);