OBSOLETE REVIEW. See http://codereview.chromium.org/10382149/

chrome/browser/resources/extensions/extensions.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. */
 
 html.loading * {
   -webkit-transition-duration: 0 !important;
 }
 
 /* Developer mode */
 
@@ skipping 119 matching lines @@
   display: inline-block;
 }
 
 .enabled-text {
   font-weight: bold;
 }
 
 .extension-list-item-wrapper.disabled-extension .enabled-text,
 .extension-list-item-wrapper:not(.disabled-extension) .enable-text,
 .extension-list-item-wrapper.disabled-extension .optional-controls,
-.extension-list-item-wrapper.disabled-extension .butter-bar {
+.extension-list-item-wrapper.disabled-extension .incognito-butter-bar {
   display: none;
 }
 
 .terminated-reload-link {
   -webkit-margin-end: 2em;
 }
 
 .extension-list-item a {
   -webkit-margin-start: 0.5em;
   display: inline-block;
@@ skipping 25 matching lines @@
   vertical-align: middle;
 }
 
 .extension-list-item:not(:hover) .trash:not(:focus) {
   opacity: 0;
 }
 
 .extension-list-item-wrapper.may-not-disable .trash {
   visibility: hidden;
 }