MD Download: add "Nothing to see here..." empty downloads message

chrome/browser/resources/md_downloads/manager.js

 // Copyright 2015 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('downloads', function() {
   var Manager = Polymer({
     is: 'downloads-manager',
 
     created: function() {
       /** @private {!downloads.ActionService} */
@@ skipping 142 matching lines @@
         // If |before| is null, |item| will just get added at the end.
         this.$['downloads-list'].insertBefore(item, before);
       }
 
       this.hasDownloads_ = this.size_() > 0;
 
       if (loadTimeData.getBoolean('allowDeletingHistory'))
         this.$.toolbar.downloadsShowing = this.hasDownloads_;
 
       this.onResize_();
+      this.$.panel.classList.remove('loading');
     },
 
     /**
      * @param {!downloads.Data} data
      * @private
      */
     updateItem_: function(data) {
       this.idMap_[data.id].update(data);
       this.onResize_();
     },
@@ skipping 12 matching lines @@
   };
 
   Manager.onLoad = function() {
     document.querySelector('downloads-manager').onLoad_();
   };
 
   return {Manager: Manager};
 });
 
 window.addEventListener('load', downloads.Manager.onLoad);