Hide proxy settings when not connected at network select screen

chrome/browser/resources/chromeos/login/oobe_welcome.js

 // Copyright 2016 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.
 
 /**
  * @fileoverview Polymer element for displaying material design OOBE.
  */
 
 Polymer({
   is: 'oobe-welcome-md',
@@ skipping 178 matching lines @@
 
   /**
    * Handles "visible" event.
    * @private
    */
   onAnimationFinish_: function() {
     this.focus();
   },
 
   /**
-   * Returns custom items for network selector.
+   * Returns custom items for network selector. Shows 'Proxy settings' only
+   * when connected to a network.
    * @private
    */
-  getNetworkCustomItems_: function() {
+  getNetworkCustomItems_: function(isConnected_) {
     var self = this;
-    return [
+    var items = [
       {
         customItemName: 'proxySettingsMenuName',
         polymerIcon: 'oobe-welcome-20:add-proxy',
         customData: {
           onTap: function() { self.OpenProxySettingsDialog_(); },
         },
       },
       {
         customItemName: 'addWiFiNetworkMenuName',
         polymerIcon: 'oobe-welcome-20:add-wifi',
         customData: {
           onTap: function() { self.OpenAddWiFiNetworkDialog_(); },
         },
       },
       {
         customItemName: 'addMobileNetworkMenuName',
         polymerIcon: 'oobe-welcome-20:add-cellular',
         customData: {
           onTap: function() { self.OpenAddWiFiNetworkDialog_(); },
         },
       },
     ];
+    if (isConnected_)
+      return items;
+    return items.slice(1);
   },
 
   /**
    * Returns true if timezone button should be visible.
    * @private
    */
   isTimezoneButtonVisible_: function(highlightStrength) {
     return highlightStrength === 'strong';
   },
 
@@ skipping 246 matching lines @@
    * @private
    */
   onTimezoneSelected_: function(event) {
     var item = event.detail;
     if (!item)
       return;
 
     this.screen.onTimezoneSelected_(item.value);
   },
 });