Settings: Internet: Update proxy controlled indicator and fields.

chrome/browser/resources/settings/internet_page/network_proxy_exclusions.js

 // Copyright 2015 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 a list of proxy exclusions.
  * Includes UI for adding, changing, and removing entries.
  */
 
 (function() {
 
 Polymer({
   is: 'network-proxy-exclusions',
 
   properties: {
+    /** Whether or not the proxy values can be edited. */
+    editable: {
+      type: Boolean,
+      value: false,
+    },
+
     /**
      * The list of exclusions.
      * @type {!Array<string>}
      */
     exclusions: {
       type: Array,
       value: function() { return []; },
       notify: true
     }
   },
 
   /**
    * Event triggered when an item is removed.
    * @param {!{model: !{index: number}}} event
    * @private
    */
   onRemoveTap_: function(event) {
     var index = event.model.index;
     this.splice('exclusions', index, 1);
     this.fire('proxy-change');
   }
 });
 })();