Tabs API is usable without tabs permission.

chrome/common/extensions/permissions/permission_set_unittest.cc

Index: chrome/common/extensions/permissions/permission_set_unittest.cc
diff --git a/chrome/common/extensions/permissions/permission_set_unittest.cc b/chrome/common/extensions/permissions/permission_set_unittest.cc
index 17f7cca2dbe1f21e254a4344900fece2f1ef3fd8..3288597d6093041a9f7019378ffe53210bd3f42b 100644
--- a/chrome/common/extensions/permissions/permission_set_unittest.cc
+++ b/chrome/common/extensions/permissions/permission_set_unittest.cc
@@ -647,20 +647,21 @@ TEST(PermissionsTest, DefaultFunctionAccess) {
     { "bookmarks",      false },
     { "cookies",        false },
     { "history",        false },
-    { "tabs.onUpdated", false },
     // Make sure we find the module name after stripping '.' and '/'.
     { "browserAction/abcd/onClick",  true },
     { "browserAction.abcd.onClick",  true },
     // Test Tabs functions.
     { "tabs.create",      true},
     { "tabs.update",      true},
-    { "tabs.getSelected", false},
+    { "tabs.getSelected", true},
+    { "tabs.onUpdated",   true },
   };
 
   scoped_refptr<PermissionSet> empty = new PermissionSet();
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kTests); ++i) {
     EXPECT_EQ(kTests[i].expect_success,
-              empty->HasAccessToFunction(kTests[i].permission_name));
+              empty->HasAccessToFunction(kTests[i].permission_name))
+                  << "Permission being tested: " << kTests[i].permission_name;
   }
 }