Integrate About page into Settings for Chrome OS settings in a window.

chrome/browser/resources/options/options.js

Index: chrome/browser/resources/options/options.js
diff --git a/chrome/browser/resources/options/options.js b/chrome/browser/resources/options/options.js
index 6000086228412a45ab4d246169bc74023a7bcf24..c5a7342ce0332f4bb2fbd3f720888f24988a10c5 100644
--- a/chrome/browser/resources/options/options.js
+++ b/chrome/browser/resources/options/options.js
@@ -205,6 +205,12 @@ function load() {
                                 BrowserOptions.getInstance());
     PageManager.registerOverlay(ThirdPartyImeConfirmOverlay.getInstance(),
                                 LanguageOptions.getInstance());
+    if (loadTimeData.getBoolean('showVersion')) {
+      PageManager.registerOverlay(ChannelChangePage.getInstance(),
+                                  HelpPage.getInstance());
+      PageManager.registerOverlay(HelpPage.getInstance(),
+                                  BrowserOptions.getInstance());
+    }
   }
 
   if (!cr.isWindows && !cr.isMac) {