Rewrite ExtensionApiTest.SandboxedPages to catch exceptions.

chrome/test/data/extensions/api_test/sandboxed_pages/main.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var secret = 'main_window_secret';
 
 onmessage = function(event) {
   var sandboxedWindow = event.source;
   // They can't read our secret.
   chrome.test.assertEq(undefined, event.data);
 
   // And we can't read theirs.
-  chrome.test.assertEq(undefined, sandboxedWindow.secret);
+  sandboxedWindowSecret = undefined;
+  try {
+    sandboxedWindowSecret = sandboxedWindow.secret;
+  } catch (e) {}
+  chrome.test.assertEq(undefined, sandboxedWindowSecret);
 
   chrome.test.succeed();
 };
 
 onload = function() {
   chrome.test.runTests([
     function sandboxedWindow() {
       var w = window.open('sandboxed.html');
     },
 
     function sandboxedFrame() {
       var iframe = document.createElement('iframe');
       iframe.src = 'sandboxed.html';
       document.body.appendChild(iframe);
     }
   ]);
 };