Clean up copy&paste in confirmation dialogs for prefs

chrome/browser/resources/options/instant_confirm_overlay.js

-// Copyright (c) 2012 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.
-
-cr.define('options', function() {
-  var SettingsDialog = options.SettingsDialog;
-
-  /*
-   * InstantConfirmOverlay class
-   * Dialog to confirm that the user really wants to enable Chrome Instant.
-   * @extends {SettingsDialog}
-   */
-  function InstantConfirmOverlay() {
-    SettingsDialog.call(this,
-                        'instantConfirm',
-                        loadTimeData.getString('instantConfirmOverlayTabTitle'),
-                        'instantConfirmOverlay',
-                        $('instantConfirmOk'),
-                        $('instantConfirmCancel'));
-  };
-
-  cr.addSingletonGetter(InstantConfirmOverlay);
-
-  InstantConfirmOverlay.prototype = {
-    __proto__: SettingsDialog.prototype,
-
-    /** @inheritDoc */
-    initializePage: function() {
-      SettingsDialog.prototype.initializePage.call(this);
-    },
-
-    /** @inheritDoc */
-    handleConfirm: function() {
-      SettingsDialog.prototype.handleConfirm.call(this);
-      Preferences.setBooleanPref('instant.confirm_dialog_shown', true, true);
-      Preferences.setBooleanPref('instant.enabled', true, true);
-    },
-
-    /** @inheritDoc */
-    handleCancel: function() {
-      SettingsDialog.prototype.handleCancel.call(this);
-      $('instant-enabled-control').checked = false;
-    },
-  };
-
-  // Export
-  return {
-    InstantConfirmOverlay: InstantConfirmOverlay
-  };
-});