MD Settings: Internet: Clean up network and proxy sections.

chrome/browser/resources/settings/internet_page/network_proxy_input.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 and editing a single
  * network proxy value. When the URL or port changes, a 'proxy-change' event is
  * fired with the combined url and port values passed as a single string,
  * url:port.
  */
 Polymer({
   is: 'network-proxy-input',
 
   properties: {
     /**
      * Whether or not the proxy value can be edited.
      */
     editable: {
       type: Boolean,
-      value: false
+      value: false,
     },
 
     /**
      * A label for the proxy value.
      */
     label: {
       type: String,
-      value: 'Proxy'
+      value: 'Proxy',
     },
 
     /**
      * The proxy object.
      * @type {!CrOnc.ProxyLocation}
      */
     value: {
       type: Object,
-      value: function() { return {Host: '', Port: 80}; },
-      notify: true
+      value: function() {
+        return {Host: '', Port: 80};
+      },
+      notify: true,
     },
   },
 
   /**
    * Event triggered when an input value changes.
    * @private
    */
   onValueChange_: function() {
+    if (!this.value.Host)
+      return;
     var port = parseInt(this.value.Port, 10);
     if (isNaN(port))
       port = 80;
     this.value.Port = port;
     this.fire('proxy-change', {value: this.value});
   }
 });