Tabs API is usable without tabs permission.

chrome/browser/extensions/all_urls_apitest.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_test_message_listener.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/common/extensions/extension.h"
@@ skipping 65 matching lines @@
                                           false);
   ExtensionTestMessageListener listener5b("execute: " + page_url.spec(), false);
   ui_test_utils::NavigateToURL(browser(), page_url);
   ASSERT_TRUE(listener5a.WaitUntilSatisfied());
   ASSERT_TRUE(listener5b.WaitUntilSatisfied());
 }
 
 // Test that an extension NOT whitelisted for scripting can ask for <all_urls>
 // and run scripts on non-restricted all pages.
 IN_PROC_BROWSER_TEST_F(AllUrlsApiTest, RegularExtensions) {
-  // First load the two extension.
+  // First load the two extensions.
   FilePath extension_dir1 = test_data_dir_.AppendASCII("all_urls")
                                           .AppendASCII("content_script");
   FilePath extension_dir2 = test_data_dir_.AppendASCII("all_urls")
                                           .AppendASCII("execute_script");
 
 
   ExtensionService* service = browser()->profile()->GetExtensionService();
   const size_t size_before = service->extensions()->size();
   ASSERT_TRUE(LoadExtension(extension_dir1));
   ASSERT_TRUE(LoadExtension(extension_dir2));
   EXPECT_EQ(size_before + 2, service->extensions()->size());
 
   // Now verify we can script a regular http page.
   ASSERT_TRUE(test_server()->Start());
   GURL page_url = test_server()->GetURL(kAllUrlsTarget);
   ExtensionTestMessageListener listener1a("content script: " + page_url.spec(),
                                           false);
   ExtensionTestMessageListener listener1b("execute: " + page_url.spec(), false);
   ui_test_utils::NavigateToURL(browser(), page_url);
   ASSERT_TRUE(listener1a.WaitUntilSatisfied());
   ASSERT_TRUE(listener1b.WaitUntilSatisfied());
 }