WebUI Prefs: Don't use display:block for labels

chrome/browser/resources/options/options_page.css

 body {
   cursor: default;
   font-size: 13px;
 }
 
 a:link {
   color: rgb(63, 110, 194);
 }
 
 a:active {
@@ skipping 353 matching lines @@
 }
 
 section > div:only-of-type {
   -webkit-box-flex: 1;
 }
 
 .option {
   margin-top: 0;
 }
 
-/* TODO(stuartmorgan): make this less specific once all pages
- * are converted to the non-table style.
- */
-section > div:only-of-type label {
+div.checkbox,
+div.radio {
   margin: 5px 0;
 }
 
-label.checkbox,
-label.radio {
-  display: block
-}
-
 .hidden {
   display: none !important;
 }
 
 div.disabled {
   color: #888;
 }
 
 .touch-slider {
   -webkit-appearance: slider-horizontal;
@@ skipping 327 matching lines @@
 }
 
 html[os=mac] label > input[type=checkbox],
 html[os=mac] label > input[type=radio] {
   margin-top: 2px;
 }
 
 .suboption {
   -webkit-margin-start: 16px;
 }