Remove the managed banner from the Chrome settings UI

chrome/browser/resources/options/chromeos/internet_detail.js

 // 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.
 
 cr.define('options.internet', function() {
   var OptionsPage = options.OptionsPage;
   /** @const */ var ArrayDataModel = cr.ui.ArrayDataModel;
   /** @const */ var IPAddressField = options.internet.IPAddressField;
 
   /**
@@ skipping 362 matching lines @@
      * @private
      */
     updateProxyBannerVisibility_: function() {
       var bannerDiv = $('info-banner');
       // Show banner and determine its message if necessary.
       var controlledBy = $('direct-proxy').controlledBy;
       if (!controlledBy || controlledBy == '') {
         bannerDiv.hidden = true;
       } else {
         bannerDiv.hidden = false;
-        // controlledBy must match strings loaded in proxy_handler.cc and
-        // set in proxy_cros_settings_provider.cc.
-        $('banner-text').textContent = loadTimeData.getString(controlledBy);
+        // The possible banner texts are loaded in proxy_handler.cc.
+        var bannerText = 'proxyBanner' + controlledBy.charAt(0).toUpperCase() +
+                         controlledBy.slice(1);
+        $('banner-text').textContent = loadTimeData.getString(bannerText);
       }
     },
 
     /**
      * Handler for when the user clicks on the checkbox to allow a
      * single proxy usage.
      * @private
      * @param {Event} e Click Event.
      */
     toggleSingleProxy_: function(e) {
@@ skipping 621 matching lines @@
 
     // Don't show page name in address bar and in history to prevent people
     // navigate here by hand and solve issue with page session restore.
     OptionsPage.showPageByName('detailsInternetPage', false);
   };
 
   return {
     DetailsInternetPage: DetailsInternetPage
   };
 });