Tabs API is usable without tabs permission.

chrome/browser/extensions/all_urls_apitest.cc

Index: chrome/browser/extensions/all_urls_apitest.cc
diff --git a/chrome/browser/extensions/all_urls_apitest.cc b/chrome/browser/extensions/all_urls_apitest.cc
index e22e8ecda1d0787c604513e18e5748ba48b1974a..632064484b0bc302e8275142ec1de8a4ddfa34fa 100644
--- a/chrome/browser/extensions/all_urls_apitest.cc
+++ b/chrome/browser/extensions/all_urls_apitest.cc
@@ -83,7 +83,7 @@ IN_PROC_BROWSER_TEST_F(AllUrlsApiTest, WhitelistedExtension) {
 // 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")