Files.app: Make delete button on the toolbar standard button instead of CommandButton.

ui/file_manager/file_manager/foreground/css/file_manager.css

 /* Copyright (c) 2014 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. */
 
 /* Special attribute used in HTML to hide elements. */
 body[type='folder'] [invisibleif~='folder'],
 body[type='upload-folder'] [invisibleif~='upload-folder'],
 body[type='saveas-file'] [invisibleif~='saveas-file'],
 body[type='open-file'] [invisibleif~='open-file'],
 body[type='open-multi-file'] [invisibleif~='open-multi-file'],
@@ skipping 1367 matching lines @@
   overflow: hidden;
   position: absolute;
   transition: opacity 220ms ease;
   width: 28px;
 }
 
 #list-container list li:not([selected]) .detail-thumbnail.loaded {
   opacity: 1;
 }
 
-#delete-button[disabled] {
-  display: none;
-}
-
 #tasks-menu cr-menu-item:not(.change-default) {
   background-position: left 10px center;
   padding-left: 32px;
 }
 
 #share-button {
   display: block;
   min-width: 0;  /* overrride */
 }
 
@@ skipping 583 matching lines @@
   padding: 20px 15px;
 }
 
 .text-measure {
   pointer-events: none;
   position: absolute;
   top: 0;
   visibility: hidden;
   z-index: -1;
 }