don't display platform app resources in normal browser windows

chrome/test/data/extensions/platform_apps/navigation/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.
 
 chrome.test.getConfig(function(config) {
   var IN_APP_URL = 'nav-target.html';
   var REMOTE_URL = 'http://localhost:' + config.testServer.port
       '/files/extensions/platform_apps/navigation/nav-target.html';
 
   var testForm = document.getElementById('test-form');
@@ skipping 38 matching lines @@
     function() {
       testForm.method = 'POST';
       testForm.action = REMOTE_URL;
       testForm.submit();
     },
 
     // Clicks on links (in-app and remote).
     function() { testLink.href = IN_APP_URL; clickTestLink(); },
     function() { testLink.href = REMOTE_URL; clickTestLink(); },
 
+    // Links with target blank and a remote URL open a new tab in the browser
+    // (verified in C++).
+    function() {
+      testLink.target = '_blank';
+      testLink.href = IN_APP_URL;
+      clickTestLink();
+    },
+    function() { testLink.href = 'http://chromium.org'; clickTestLink(); },
+
     // If we manage to execute this test case, then we haven't navigated away.
     function() { chrome.test.notifyPass(); }
   ];
 
   var testIndex = 0;
 
   function runTest() {
     var test = tests[testIndex++];
 
     console.log('Testing ' + (testIndex - 1) + ': ' + test);
     test();
 
     if (testIndex < tests.length) {
       // Don't run the next test immediately, since navigation happens
       // asynchronously, and if we do end up navigating, we don't want to still
       // execute the final test case (which signals success).
       window.setTimeout(runTest, 100);
     }
   }
 
   runTest();
 });