Fix some more for= usage.

chrome/browser/resources/options/browser_options.css

 /* 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. */
 
 #change-home-page-section {
   margin-left: 30px;
 }
 
 #home-page-url {
   display: inline-block;
@@ skipping 429 matching lines @@
 
 #keyboard-overlay table {
   /* Same as .settings-row {margin}. */
   -webkit-border-vertical-spacing: 0.65em;
 }
 
 #accessibility-autoclick .controlled-setting-with-label {
   -webkit-box-align: baseline;
 }
 
-#accessibility-autoclick label + select {
+#accessibility-autoclick-dropdown,
+#accessibility-autoclick-label {
   /* Same as .controlled-setting-with-label > input + span. */
   -webkit-margin-start: 0.6em;
 }
 
 div[guestmode=true] :-webkit-any(
 <if expr="not chromeos">
     #searchBox,
 </if>
     #appearance-section,
     #startup-section,
     #reset-profile-settings-section) {
   display: none;
 }
 
 footer {
   display: flex;
 }
 
 #version-button {
   -webkit-margin-start: auto;
   color: #999;
 }
+
+/* An input that has no function except to take up the same amount of space as
+ * a checkbox. */
+.spacer-checkbox {
+  visibility: hidden;
+}