Files.app: Remove the ButterBar class.

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 82 matching lines @@
 }
 
 .scrollbar-vertical > .scrollbar-button:hover {
   opacity: 0.4;
 }
 
 .scrollbar-vertical > .scrollbar-button.pressed {
   opacity: 0.5;
 }
 
-#butter-bar-container {
-  width: 100%;
-}
-
-#butter-bar {
-  color: #666;
-  display: -webkit-box;
-  padding: 15px;
-}
-
-#butter-bar:not(.visible) {
-  display: none;
-}
-
-#butter-bar .content {
-  -webkit-box-flex: 1.0;
-  -webkit-box-orient: block-axis;
-  -webkit-box-pack: end;
-  display: -webkit-box;
-}
-
-#butter-bar .actions {
-  -webkit-box-align: end;
-  -webkit-box-orient: horizontal;
-  -webkit-box-pack: end;
-  -webkit-margin-start: 6px;
-  display: -webkit-box;
-}
-
-#butter-bar .actions a {
-  color: rgb(17, 85, 204);
-  cursor: pointer;
-  vertical-align: middle;
-}
-
-#butter-bar .actions a.x {
-  background: center center no-repeat;
-  background-image: -webkit-image-set(
-    url('../images/files/ui/close_bar.png') 1x,
-    url('../images/files/ui/2x/close_bar.png') 2x);
-  display: inline-block;
-  height: 35px;  /* #butter-bar .content's min-height. */
-  margin-right: -12px;
-  width: 35px;
-}
-
-#butter-bar .actions a.x:first-child {
-  margin-left: -6px;
-}
-
-#butter-bar .actions a.x {
-  margin-bottom: -14px;
-}
-
-#butter-bar .butter-message.single-line {
-  line-height: 2.0;
-  overflow: hidden;
-  text-overflow: ellipsis;
-  white-space: nowrap;
-}
-
 /* Main part of the dialog between header and footer. */
 .dialog-container {
   -webkit-box-align: stretch;
   -webkit-box-flex: 1;
   -webkit-box-orient: horizontal;
   background-color: white;  /* Makes #drag-container invisible. */
   border-radius: 2px;
   display: -webkit-box;
   overflow: hidden;
   position: relative;
@@ skipping 1930 matching lines @@
       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;
 }