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

chrome/browser/resources/options2/options_bundle.js

Index: chrome/browser/resources/options2/options_bundle.js
diff --git a/chrome/browser/resources/options2/options_bundle.js b/chrome/browser/resources/options2/options_bundle.js
index fc600e7783e36dc6247ae191780a556cd7212969..2cdf6b5726806eec835b030b3805ed6e39742a6a 100644
--- a/chrome/browser/resources/options2/options_bundle.js
+++ b/chrome/browser/resources/options2/options_bundle.js
@@ -12,7 +12,6 @@
 <include src="controlled_setting.js"></include>
 <include src="options_page.js"></include>
 <if expr="pp_ifdef('chromeos')">
-  <include src="about_page.js"></include>
   <include src="../chromeos/user_images_grid.js"></include>
   <include src="chromeos/cellular_plan_element.js"></include>
   <include src="chromeos/change_picture_options.js"></include>
@@ -31,7 +30,6 @@
   <include src="chromeos/accounts_user_name_edit.js"></include>
   <include src="chromeos/virtual_keyboard.js"></include>
   <include src="chromeos/virtual_keyboard_list.js"></include>
-  var AboutPage = options.AboutPage;
   var AccountsOptions = options.AccountsOptions;
   var ChangePictureOptions = options.ChangePictureOptions;
   var InternetOptions = options.InternetOptions;