Move topSites API out of experimental

chrome/common/extensions/docs/examples/api/topsites/magic8ball/newTab.css

 /* Copyright (c) 2011 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 html {
   background-color: #ddd;
 }
 
 #spacer {
   height: 200px;
 }
 
 #title {
   color: #555;
-  font-size: 400%;
   font-weight: bold;
+  height: 200px;
   vertical-align: middle;
 }
 
 #mostVisitedThumb {
-  display: inline-block;
-  height: 132px;
+  background-repeat: no-repeat;
+  height: 200px;
   margin-left: 20px;
-  position: relative;
+  padding-left: 20px;
   vertical-align: middle;
   width: 212px;
 }
-
-#mostVisitedThumb span {
-  background-repeat: no-repeat;
-  bottom: -23px;
-  padding-left: 20px;
-  position: absolute;
-  white-space: nowrap;
-}