redesign and reimplement proxy config service and tracker, revise proxy ui on cros

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

 // Copyright (c) 2011 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', function() {
   var OptionsPage = options.OptionsPage;
   const ArrayDataModel = cr.ui.ArrayDataModel;
 
   /////////////////////////////////////////////////////////////////////////////
   // InternetOptions class:
@@ skipping 430 matching lines @@
       inetAddress = data.ipconfigDHCP.address;
       inetSubnetAddress = data.ipconfigDHCP.subnetAddress;
       inetGateway = data.ipconfigDHCP.gateway;
       inetDns = data.ipconfigDHCP.dns;
     }
 
     // Hide the dhcp/static radio if needed.
     $('ipTypeDHCPDiv').hidden = !data.showStaticIPConfig;
     $('ipTypeStaticDiv').hidden = !data.showStaticIPConfig;
 
-    // Hide change-proxy-button if proxy is not configurable.
-    $('change-proxy-button').hidden = !data.proxyConfigurable;
-    // If necessary, set text for change-proxy-text and show it.
-    var changeProxyText = $('change-proxy-text');
-    if (data.changeProxyText != '') {
-      changeProxyText.textContent =
-          localStrings.getString(data.changeProxyText);
-      changeProxyText.hidden = false;
-    } else {
-      changeProxyText.hidden = true;
-    }
-    // Hide change-proxy-section if button and text are hidden.
-    $('change-proxy-section').hidden = !data.proxyConfigurable &&
-                                       changeProxyText.hidden;
+    // Hide change-proxy-button and change-proxy-section if not showing proxy.
+    $('change-proxy-button').hidden = !data.showProxy;
+    $('change-proxy-section').hidden = !data.showProxy;
 
     var ipConfigList = $('ipConfigList');
     ipConfigList.disabled = $('ipTypeDHCP').checked || !data.showStaticIPConfig;
     options.internet.IPConfigList.decorate(ipConfigList);
     ipConfigList.autoExpands = true;
     var model = new ArrayDataModel([]);
     model.push({
       'property': 'inetAddress',
       'name': localStrings.getString('inetAddress'),
       'value': inetAddress,
@@ skipping 193 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);
   };
 
   // Export
   return {
     InternetOptions: InternetOptions
   };
 });