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

chrome/browser/resources/uber/uber.html

Index: chrome/browser/resources/uber/uber.html
diff --git a/chrome/browser/resources/uber/uber.html b/chrome/browser/resources/uber/uber.html
index 7d382784daea24d7c2b0709aaa3d02db9c17dfaa..354bd0a1f7a9a37431488d7bd061f9c419339b40 100644
--- a/chrome/browser/resources/uber/uber.html
+++ b/chrome/browser/resources/uber/uber.html
@@ -21,6 +21,9 @@
   <ol>
     <li class="selected" i18n-content="settingsDisplayName"></li>
     <li i18n-content="extensionsDisplayName"></li>
+<if expr="pp_ifdef('chromeos')">
+    <li i18n-content="aboutPageDisplayName" id="aboutPageNavItem"></li>
+</if>
   </ol>
 </div>
 
@@ -32,9 +35,14 @@
 <div class="iframe-container" i18n-values="id:extensionsHost">
   <iframe src="chrome://extensions-frame/"></iframe></div>
 
-</body>
+<if expr="pp_ifdef('chromeos')">
+<div class="iframe-container" i18n-values="id:aboutPageHost">
+  <iframe src="chrome://about-page-frame/"></iframe></div>
+</if>
 
 <script src="chrome://chrome/strings.js"></script>
 <script src="chrome://resources/js/i18n_template.js"></script>
 <script src="chrome://resources/js/i18n_process.js"></script>
+
+</body>
 </html>