convert options and bug reporter to chromey checkboxes

chrome/browser/resources/options/advanced_options.css

 /*
  * Copyright (c) 2011 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.
  */
 
 #advancedPage .section-group:not(:first-child) {
   margin-top: 10px;
 }
 
 #advancedPage .section-group:not(:last-child) {
   margin-bottom: 10px;
 }
 
 #advancedPage select,
 #advancedPage .web-content-select-label {
   min-width: 145px;
 }
 
 #advancedPage .web-content-select-label > span:only-of-type {
   display: inline-block;
   min-width: 100px;
 }
 
 #download-location-group {
   margin: 10px 0 5px;
   min-width: 470px;
 }
 
-#promptForDownload {
-  margin-bottom: 10px;
-}
-
 #fontSettingsCustomizeFontsButton,
 #privacyClearDataButton {
   margin-left: 10px;
 }