Remove the managed banner from the Chrome settings UI

chrome/browser/resources/uber/uber_shared.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. */
 
 body.uber-frame {
   -webkit-margin-start: 155px;
   color: rgb(48, 57, 66);
 }
 
 html[dir='rtl'] body.uber-frame {
@@ skipping 58 matching lines @@
 body.uber-frame header button {
   margin: 0;
 }
 
 body.uber-frame header > h1 {
   margin: 0;
   padding: 21px 0 13px;
 }
 
 /* Create a border under the h1 (but before anything that gets appended
- * to the end of the header, such as the managed prefs banner). */
+ * to the end of the header). */
 body.uber-frame header > h1::after {
   -webkit-margin-end: 20px;
   background-color: #eee;
   content: ' ';
   display: block;
   height: 1px;
   position: relative;
   top: 13px;
 }
 
@@ skipping 34 matching lines @@
   }
   body.uber-frame section > h3 {
     -webkit-margin-start: -28px;
   }
 }
 
 body.uber-frame section > div:only-of-type {
   -webkit-box-flex: 1;
 }
 
-/* Styles for a hideable notification banner at the top of a page.
- * See the Options page .managed-prefs-banner for a usage example. */
+/* Styles for a hideable notification banner at the top of a page. */
 .page.showing-banner {
   margin-top: 45px;
 }
 
 .page-banner {
   background-color: white;
   width: 100%;
   z-index: 2;
 }
 
@@ skipping 25 matching lines @@
   background-size: 16px;
   display: block;
   padding-bottom: 8px;
   padding-top: 8px;
 }
 
 .page-banner.clickable:active .page-banner-text {
   background: -webkit-linear-gradient(rgb(250, 230, 145),
                                       rgb(255, 242, 183));
 }