Remove the grey border-top from the new extension docs server.

chrome/common/extensions/docs/server2/static/css/site.css

 body {
   color: #333;
   font: 13px/22px 'Open Sans',arial,sans-serif;
   font-weight: 400;
   background-color: white;
   margin: 0;
   padding: 0;
 }
 
 p {
@@ skipping 215 matching lines @@
 #gc-pagecontent {
   padding-left: 24px;
   margin: 0 0 0 180px;
 }
 
 #gc-pagecontent h2 {
   font-size: 170%;
   font-weight: normal;
   margin: 2em 0 0 0;
   padding: 40px 0;
-  border-top: 1px solid #CCC;
 }
 
 #gc-pagecontent h3 {
   font-size: 130%;
   font-weight: bold;
   margin: 1.5em 0 0 0;
   top: 0em;
 }
 
 #gc-pagecontent h3 {
@@ skipping 111 matching lines @@
   z-index: 1;
   position: relative;
 }
 
 #gc-toc div.line {
   border-top: thin solid #FAFAFA;
   height: 1px;
   margin: 1.3em 1em 0 0;
   padding: 0;
 }