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

chrome/browser/resources/options2/options.html

Index: chrome/browser/resources/options2/options.html
diff --git a/chrome/browser/resources/options2/options.html b/chrome/browser/resources/options2/options.html
index 77c1f076e576ebd8c27695f7d3573d88182d9e2a..5f2098b5ee9df974515bb52a6e9754d8e4017857 100644
--- a/chrome/browser/resources/options2/options.html
+++ b/chrome/browser/resources/options2/options.html
@@ -40,7 +40,6 @@
 <link rel="stylesheet" href="subpages_tab_controls.css">
 <link rel="stylesheet" href="../sync_setup_overlay.css">
 <if expr="pp_ifdef('chromeos')">
-  <link rel="stylesheet" href="about_page.css">
   <link rel="stylesheet" href="chromeos/accounts_options_page.css">
   <link rel="stylesheet" href="chromeos/change_picture_options.css">
   <link rel="stylesheet" href="chromeos/internet_options_page.css">
@@ -138,7 +137,6 @@
            <button class="raw-button close-subpage custom-appearance"></button>
            <div class="subpage-sheet-contents">
              <if expr="pp_ifdef('chromeos')">
-               <include src="about_page.html">
                <include src="chromeos/change_picture_options.html">
                <include src="chromeos/proxy.html">
              </if>