Options: Remove the hidden class, since we override the hidden attribute to set

chrome/browser/resources/options/options_page.css

 body {
   cursor: default;
   font-size: 13px;
 }
 
 a:link {
   color: rgb(63, 110, 194);
 }
 
 a:active {
@@ skipping 376 matching lines @@
 .option {
   margin-top: 0;
 }
 
 div.checkbox,
 div.radio {
   margin: 5px 0;
 }
 
 /* [hidden] does display:none, but its priority is too low in some cases. */
-.hidden,
 [hidden] {
   display: none !important;
 }
 
 .transparent {
   opacity: 0;
 }
 
 div.disabled {
   color: #888;
@@ skipping 363 matching lines @@
 
 html:not([hasFlashPlugin]) .flash-plugin-area,
 /* If the Flash plug-in supports the NPP_ClearSiteData API, we don't need to
  * show the link to the Flash storage settings manager:
  */
 html[flashPluginSupportsClearSiteData] .flash-plugin-area,
 html:not([flashPluginSupportsClearSiteData]) .clear-plugin-lso-data-enabled,
 html[flashPluginSupportsClearSiteData] .clear-plugin-lso-data-disabled {
   display: none;
 }