Adjust the thumbnail view to match the specs.

chrome/browser/resources/file_manager/js/file_grid.js

 // Copyright (c) 2012 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.
 
 'use strict';
 
 /**
  * FileGrid constructor.
  *
  * Represents grid for the Grid Vew in the File Manager.
@@ skipping 155 matching lines @@
 
 /**
  * @param {Element} li List item element.
  * @param {Entry} entry File entry.
  * @param {FileGrid} grid Owner.
  */
 FileGrid.Item.decorate = function(li, entry, grid) {
   li.__proto__ = FileGrid.Item.prototype;
   FileGrid.decorateThumbnail(li, entry, grid.metadataCache_, true);
 
-  if (grid.selectionModel.multiple) {
+  if (!util.platform.newUI() && grid.selectionModel.multiple) {
     var checkBox = li.ownerDocument.createElement('input');
     filelist.decorateSelectionCheckbox(checkBox, entry, grid);
     checkBox.classList.add('white');
     var bottom = li.querySelector('.thumbnail-bottom');
     bottom.appendChild(checkBox);
     bottom.classList.add('show-checkbox');
   }
 
   // Override the default role 'listitem' to 'option' to match the parent's
   // role (listbox).
   li.setAttribute('role', 'option');
 };