Rename "extras exports" to "extras binding"

test/cctest/test-extra.js

Index: test/cctest/test-extra.js
diff --git a/test/cctest/test-extra.js b/test/cctest/test-extra.js
index 829ddee01a4c140aacbfa9ca4969daae9ad7929d..f943ea6c4e5adedb79b2c44213cdcf6a8ba56c60 100644
--- a/test/cctest/test-extra.js
+++ b/test/cctest/test-extra.js
@@ -2,13 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-(function (global, exports) {
+(function (global, binding) {
   'use strict';
-  exports.testExtraShouldReturnFive = function () {
+  binding.testExtraShouldReturnFive = function () {
     return 5;
   };
 
-  exports.testExtraShouldCallToRuntime = function() {
-    return exports.runtime(3);
+  binding.testExtraShouldCallToRuntime = function() {
+    return binding.runtime(3);
   };
 })