separate about page into its own page (included in chrome://chrome)

chrome/browser/resources/uber/uber.css

 /* Copyright (c) 2012 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. */
 
 #navigation h3 {
   color: rgb(92, 97, 102);
   font-size: 18px;
   font-weight: normal;
   padding-left: 23px;
 }
@@ skipping 14 matching lines @@
 
 #navigation li:hover {
   color: #777;
 }
 
 #navigation li.selected {
   border-left-color: rgb(78, 87, 100);
   color: rgb(70, 78, 90);
 }
 
+#navigation #aboutPageNavItem {
+  margin-top: 27px;
+}
+
 .iframe-container {
   background-color: white;
   bottom: 0;
   left: 155px;
   position: absolute;
   right: 0;
   top: 0;
   z-index: 1;
 }
 
 .iframe-container.selected {
   z-index: 2;
 }
 
 iframe {
   border: none;
   display: block;
   height: 100%;
   width: 100%;
 }