Files.app: Fix a CSS to hide the cancel button for non-cancelable progress items.

chrome/browser/resources/file_manager/foreground/css/file_manager.css

 /* 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. */
 
 /* The order of z-index:
  * - 2: drag-selection-bodrder
  * - 3: preview-panel
  * - 500: scrollbar
  * - 500: splitter
  * - 525: spinner
@@ skipping 2024 matching lines @@
 #progress-center:not(.opened) #progress-center-close-view.single ~
     button.toggle,
 #progress-center button.cancel {
   background: -webkit-image-set(
       url(../images/files/ui/close_bar.png) 1x,
       url(../images/files/ui/2x/close_bar.png) 2x)
       no-repeat;
 }
 
 #progress-center:not(.opened)
-    #progress-center-close-view.single:not(.cancelable) button.toggle,
+    #progress-center-close-view.single:not(.cancelable) ~ button.toggle,
 #progress-center li:not(.cancelable) button.cancel {
   visibility: hidden;
 }
 
 #progress-center.opened button.toggle {
   background: -webkit-image-set(
       url(../images/files/ui/process_drawer_button_closed.png) 1x,
       url(../images/files/ui/2x/process_drawer_button_closed.png) 2x)
       no-repeat;
   top: 10px;
 }
 
 #progress-center.opened button.toggle:hover {
   background: -webkit-image-set(
       url(../images/files/ui/process_drawer_button_closed_hover.png) 1x,
       url(../images/files/ui/2x/process_drawer_button_closed_hover.png) 2x)
       no-repeat;
 }
 
 #progress-center.opened button.toggle:active {
   background: -webkit-image-set(
       url(../images/files/ui/process_drawer_button_closed_pressed.png) 1x,
       url(../images/files/ui/2x/process_drawer_button_closed_pressed.png) 2x)
       no-repeat;
 }