MD Settings: change settings-input to home-url-input due to reduced usage.

chrome/browser/resources/settings/appearance_page/appearance_page.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.
 
 /**
  * 'settings-appearance-page' is the settings page containing appearance
  * settings.
  *
  * Example:
  *
@@ skipping 34 matching lines @@
         return [
           {value: 9, name: loadTimeData.getString('verySmall')},
           {value: 12, name: loadTimeData.getString('small')},
           {value: 16, name: loadTimeData.getString('medium')},
           {value: 20, name: loadTimeData.getString('large')},
           {value: 24, name: loadTimeData.getString('veryLarge')},
         ];
       },
     },
 
-    /** @private */
-    isHomeUrlInvalid_: Boolean,
-
     /**
      * List of options for the page zoom drop-down menu.
      * @type {!Array<number>}
      */
     pageZoomLevels_: {
       readOnly: true,
       type: Array,
       value: [
         // TODO(dbeam): get these dynamically from C++ instead.
         1 / 4,
@@ skipping 200 matching lines @@
   /**
    * @see content::ZoomValuesEqual().
    * @param {number} zoom1
    * @param {number} zoom2
    * @return {boolean}
    * @private
    */
   zoomValuesEqual_: function(zoom1, zoom2) {
     return Math.abs(zoom1 - zoom2) <= 0.001;
   },
-
-  /**
-   * @param {!Event} event
-   * @private
-   */
-  validate_: function(event) {
-    var inputElement = Polymer.dom(event).localTarget;
-
-    if (inputElement.value == '') {
-      this.isHomeUrlInvalid_ = false;
-      return;
-    }
-
-    this.browserProxy_.validateStartupPage(inputElement.value)
-        .then(function(isValid) {
-          this.isHomeUrlInvalid_ = !isValid;
-        }.bind(this));
-  },
 });