Implement popup bubbles for the controlled setting indicator

chrome/browser/resources/options/browser_options.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. */
 
 #change-home-page-section {
   margin-left: 30px;
 }
 
 #home-page-url {
   display: inline-block;
@@ skipping 223 matching lines @@
   background-image: none;
   background-position: center center;
   display: block;
   opacity: 0.5;
   vertical-align: middle;
   width: 19px;
 }
 
 .network-group > .controlled-setting-indicator,
 .network-menu-item > .controlled-setting-indicator {
-  -webkit-box-flex: 0;
   -webkit-margin-end: 5px;
-  display: block;
-  height: 16px;
-  width: 16px;
 }
 
 .network-options-button:hover {
   opacity: 1;
 }
 
 @-webkit-keyframes vpn-connecting-animation {
   from {
     opacity: 1;
   }
@@ skipping 129 matching lines @@
 }
 
 #keyboard-overlay .option-value > select {
   width: 100%;
 }
 
 #keyboard-overlay table {
   /* Same as .settings-row {margin}. */
   -webkit-border-vertical-spacing: 0.65em;
 }