Implement 'Do Not Track' header

chrome/browser/resources/options/do_not_track_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;
+
+  /**
+   * DoNotTrackConfirmOverlay class
+   * Dialog to confirm that the user really wants to enable Do Not Track.
+   * @extends {SettingsDialog}
+   */
+  function DoNotTrackConfirmOverlay() {
+    SettingsDialog.call(this,
+                        'doNotTrackConfirm',
+                        loadTimeData.getString('doNotTrackConfirmTitle'),
+                        'do-not-track-confirm-overlay',
+                        $('do-not-track-confirm-ok'),
+                        $('do-not-track-confirm-cancel'));
+  };
+
+  cr.addSingletonGetter(DoNotTrackConfirmOverlay);
+
+  DoNotTrackConfirmOverlay.prototype = {
+    __proto__: SettingsDialog.prototype,
+
+    /** @inheritDoc */
+    handleConfirm: function() {
+      SettingsDialog.prototype.handleConfirm.call(this);
+      Preferences.setBooleanPref('enable_do_not_track', true, true);
+    },
+
+    /** @inheritDoc */
+    handleCancel: function() {
+      SettingsDialog.prototype.handleCancel.call(this);
+      $('do-not-track-enabled').checked = false;
+    },
+  };
+
+  // Export
+  return {
+    DoNotTrackConfirmOverlay: DoNotTrackConfirmOverlay
+  };
+});