Move tests for DETAILS and SUMMARY elements to html/details_summary/.

third_party/WebKit/LayoutTests/html/details_summary/details-writing-mode.html

 <style>
 td {
   border: 1px solid black;
   width: 120px;
   height: 120px;
 }
 td div {
     height: 100%;
     width: 100%;
 }
@@ skipping 44 matching lines @@
             </div>
         </td>
         <td>
             <div style="-webkit-writing-mode:vertical-rl; direction:rtl">
                 <details><summary>summary</summary></details>
                 <details open><summary>summary</summary></details>
             </div>
         </td>
     </tr>
 </table>