Convert tabs, windows, and extension APIs to feature system.

chrome/test/data/extensions/api_test/content_scripts/extension_iframe/iframe.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.
 
 // Simple success test: we want content-script APIs to be available (like
 // sendRequest), but other APIs to be undefined or throw exceptions on access.
 
 function runsWithException(f) {
   try {
     var foo = f();
     console.log('Error: ' + f + '" doesn\'t throw exception.');
     return false;
   } catch (e) {
-    if (e.message.indexOf(' can only be used in extension processes.') > -1) {
+    if (e.message.indexOf(' cannot be used in this context.') > -1) {
       return true;
     } else {
       console.log('Error: incorrect exception message: ' + e.message);
       return false;
     }
   }
 }
 
 var success = true;
 
 // The whole of chrome.storage (arbitrary unprivileged) is unavailable.
 if (chrome.storage) {
   console.log('Error: chrome.storage exists, it shouldn\'t.');
   success = false;
 }
 
-// Ditto chrome.tabs, though it's special because it's a dependency of the
-// partially unprivileged chrome.extension.
-if (chrome.tabs) {
-  console.log('Error: chrome.tabs exists, it shouldn\'t.');
-  success = false;
+// Ditto all children of chrome.tabs.
+for (p in chrome.tabs) {
+  if (chrome.tabs.hasOwnProperty(p)) {
+    if (["remove", "create", "update"].indexOf(p) == -1) {
+      if (!runsWithException(
+              function(p) { return chrome.tabs[p]; }.bind(null, p))) {
+        console.log(p);
+        success = false;
+        break;
+      }
+    }
+  }
 }
 
 // Parts of chrome.extension are unavailable.
 if (!runsWithException(function() { return chrome.extension.getViews; }))
   success = false;
 
 chrome.extension.sendRequest({success: success});