Properly launch the connectivity diagnostics app from the offline page

chrome/browser/resources/chromeos/neterror.js

Index: chrome/browser/resources/chromeos/neterror.js
diff --git a/chrome/browser/resources/chromeos/neterror.js b/chrome/browser/resources/chromeos/neterror.js
index 0c8fcc08db2295f07e4bec31c5839f2e21691399..ec69eb3d44cef58b9e3d91701f9f75e5ba2d062f 100644
--- a/chrome/browser/resources/chromeos/neterror.js
+++ b/chrome/browser/resources/chromeos/neterror.js
@@ -14,11 +14,8 @@ function toggleHelpBox() {
 }
 
 function diagnoseErrors() {
-  var extensionId = 'idddmepepmjcgiedknnmlbadcokidhoa';
-  var diagnoseFrame = $('diagnose-frame');
-  diagnoseFrame.innerHTML =
-      '<iframe src="chrome-extension://' + extensionId +
-      '/index.html"></iframe>';
+  window.domAutomationController.setAutomationId(1);
+  window.domAutomationController.send('open_connectivity_diagnostics');
 }
 
 // Subframes use a different layout but the same html file.  This is to make it