Fix the pref binding by binding to the object rather than the element

chrome/browser/resources/settings/a11y_page/a11y_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.
 
 /**
  * @fileoverview
  * 'cr-settings-a11y-page' is the settings page containing accessibility
  * settings.
  *
  * Example:
  *
  *    <iron-animated-pages>
  *      <cr-settings-a11y-page prefs="{{prefs}}"></cr-settings-a11y-page>
  *      ... other pages ...
  *    </iron-animated-pages>
  *
  * @group Chrome Settings Elements
  * @element cr-settings-a11y-page
  */
 Polymer({
   is: 'cr-settings-a11y-page',
 
   properties: {
     /**
      * Preferences state.
-     *
-     * @type {?CrSettingsPrefsElement}
-     * @default null
      */
     prefs: {
       type: Object,
       notify: true,
     },
 
     /**
      * Route for the page.
      */
     route: String,
@@ skipping 26 matching lines @@
 
     /**
      * Name of the 'iron-icon' to show.
      */
     icon: {
       type: String,
       value: 'accessibility',
       readOnly: true,
     },
   },
-
-  /**
-   * Called when the selected value of the autoclick dropdown changes.
-   * TODO(jlklein): Replace with binding when paper-dropdown lands.
-   * @private
-   */
-  autoclickSelectChanged_: function() {
-    this.prefs.settings.settings.a11y.autoclick_delay_ms =
-        this.$.autoclickDropdown.value;
-  },
 });