Move wallpaper progress bar on top of thumbnails (completely remove butter bar)

chrome/browser/resources/chromeos/wallpaper_manager/js/wallpaper_images_grid.js

 // Copyright (c) 2013 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.
 
 cr.define('wallpapers', function() {
   /** @const */ var ArrayDataModel = cr.ui.ArrayDataModel;
   /** @const */ var Grid = cr.ui.Grid;
   /** @const */ var GridItem = cr.ui.GridItem;
   /** @const */ var GridSelectionController = cr.ui.GridSelectionController;
   /** @const */ var ListSingleSelectionModel = cr.ui.ListSingleSelectionModel;
@@ skipping 15 matching lines @@
   }
 
   WallpaperThumbnailsGridItem.prototype = {
     __proto__: GridItem.prototype,
 
     /** @override */
     decorate: function() {
       GridItem.prototype.decorate.call(this);
       // Removes garbage created by GridItem.
       this.innerText = '';
-      cr.defineProperty(this, 'active', cr.PropertyKind.BOOL_ATTR);
-      this.active = false;
       var imageEl = cr.doc.createElement('img');
       imageEl.classList.add('thumbnail');
       cr.defineProperty(imageEl, 'offline', cr.PropertyKind.BOOL_ATTR);
       imageEl.offline = this.dataItem.availableOffline;
       this.appendChild(imageEl);
-      var checkMark = cr.doc.createElement('div');
-      checkMark.classList.add('check');
-      this.appendChild(checkMark);
+
       var self = this;
       chrome.wallpaperPrivate.getThumbnail(this.dataItem.baseURL,
                                            function(data) {
         if (data) {
           var blob = new Blob([new Int8Array(data)], {'type' : 'image\/png'});
           imageEl.src = window.URL.createObjectURL(blob);
           imageEl.addEventListener('load', function(e) {
             window.URL.revokeObjectURL(this.src);
           });
         } else {
@@ skipping 128 matching lines @@
       this.columns = 0;
       this.redraw();
       this.focus();
     }
   };
 
   return {
     WallpaperThumbnailsGrid: WallpaperThumbnailsGrid
   };
 });