Fix some more for= usage.

chrome/browser/resources/options/browser_options.css

Index: chrome/browser/resources/options/browser_options.css
diff --git a/chrome/browser/resources/options/browser_options.css b/chrome/browser/resources/options/browser_options.css
index 960aa5f3d53a49238a42717b28205f2dbdea39f5..39e34caac63bb807ea37d86a8b05fc5b0262c03c 100644
--- a/chrome/browser/resources/options/browser_options.css
+++ b/chrome/browser/resources/options/browser_options.css
@@ -447,7 +447,8 @@ list:not([disabled]) > .network-group[selected] {
   -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;
 }
@@ -470,3 +471,9 @@ footer {
   -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;
+}